Add readme with installation instruction

configs/client-config-example.yaml

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+Address: # Enter address to run client.
+
+MasterConnection:
+  Address: # Address on which the testing system is started.
+
+StorageConnection:
+  Address: # Address on which the testing system is started.
+
+DB:
+  Dsn: # Use your postgres dsn to connect to database.
+
+ResourcesPath: # Path of folder "clients/resources" in testing system repository
+
+Admin: true # Use this parameter to set up admin frontend client, it will be available at path /admin
+TestingSystemAPI:
+  DefaultLoadFilesHead: 100 # Number of first bytes to load for each file that is served.
+

configs/compiler/config.yaml

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+Languages:
+  cpp:
+    Template: "cpp.sh.tmpl"

configs/compiler/scripts/cpp.sh.tmpl

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+#!/bin/bash
+
+g++ "{{.source}}" -std=c++20 -O2 -o "{{.binary}}"

configs/config-invoker-example.yaml

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+Port: # enter the port to run the invoker
+# Host: "enter the host string value" # By default, Host equals to localhost
+
+Logger:
+  # LogPath: "path to save logs" # By default, logs are written to stdout and stderr
+  # LogLevel: 0. # By default LogLevel is 0.
+  # Possible log levels are: 0 (Trace), 1 (Debug), 2 (Info), 3 (Warn), 4 (Error)
+
+Invoker:
+  # AutodetectPublicAddress is used to automatically detect public address of invoker.
+  # This address will be used for master to communicate with invoker.
+  # With this parameter, the configuration file can be the same for all invokers that are started in some cloud service.
+  AutodetectPublicAddress: true
+  # Threads defines the number of simultaneous processes allowed to run at the same time.
+  # It is strongly recommended to keep this config equal to 1
+  Threads: 1
+  # Sandboxes defines the number of simultaneous test runs that are processed at the same time.
+  # The best value for this parameter is Threads * 2
+  Sandboxes: 2
+  # QueueSize defines the number of test runs that are added to invoker and their resources are loading.
+  # The best value for this parameter is 1, but for slow networks it can be grater
+  QueueSize: 1
+  # SandboxType defines the type of sandbox used for process isolation. Possible values are "isolate" and "simple"
+  # It is strongly recommended to use "isolate" for safe process execution
+  SandboxType: "isolate"
+  # CacheSize defines the size of the cached files (in bytes). It is recommended to have it al least 10^9 or more.
+  CacheSize: 1000000000
+  # SaveOutputHead defines the number of bytes that should be saved for each resource, produced by solution.
+  # If this parameter is absent, the full content of each resource will be saved.
+  SaveOutputHead: 100
+  # SandboxHomePath is the path to directory for some sandbox specific files. This directory should be empty.
+  SandboxHomePath: "some path to empty directory"
+  # SandboxHomePath is the path to directory for cached files. This directory should be empty.
+  # The cache is reset at each invoker restart.
+  CachePath: "some cache path to empty directory"
+  # CompilerConfigsFolder is the path to directory, containing compiler configs (just like the folder configs/compiler)
+  CompilerConfigsFolder: "path to compiler configs"
+  # MasterPingInterval: 1s # The interval at which invoker pings master. By default, equal to 1s
+
+DB:
+  Dsn: # Use your postgres dsn on master server to connect to database.
+
+MasterConnection:
+  Address: # Public address of master server
+
+StorageConnection:
+  Address: # Public address of master server

configs/config-master-example.yaml

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+Port: # enter the port to run the testing system
+# Host: "enter the host string value" # By default, Host equals to localhost
+
+Logger:
+  # LogPath: "path to save logs" # By default, logs are written to stdout and stderr
+  # LogLevel: 0. # By default LogLevel is 0.
+  # Possible log levels are: 0 (Trace), 1 (Debug), 2 (Info), 3 (Warn), 4 (Error)
+
+Master:
+  # InvokersPingInterval defines the interval at which invokers should be pinged.
+  InvokersPingInterval: 1s
+
+Storage:
+  # StoragePath defines the path to store all resources.
+  StoragePath: "some path to folder containing all the resources"
+
+DB:
+  Dsn: "postgresql://localhost:5432/ts" # Use your postgres dsn to connect to database.
+
+MasterConnection:
+  Address: "http://localhost:<port>" # Use the port that is defined in Port parameter for testing system.
+
+StorageConnection:
+  Address: "http://localhost:<port>" # Use the port that is defined in Port parameter for testing system.

configs/config-single-example.yaml

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+Port: # enter the port to run the testing system
+# Host: "enter the host string value" # By default, Host equals to localhost
+
+Logger:
+  # LogPath: "path to save logs" # By default, logs are written to stdout and stderr
+  # LogLevel: 0. # By default LogLevel is 0.
+  # Possible log levels are: 0 (Trace), 1 (Debug), 2 (Info), 3 (Warn), 4 (Error)
+
+Invoker:
+  # Threads defines the number of simultaneous processes allowed to run at the same time.
+  # It is strongly recommended to keep this config equal to 1
+  Threads: 1
+  # Sandboxes defines the number of simultaneous test runs that are processed at the same time.
+  # The best value for this parameter is Threads * 2
+  Sandboxes: 2
+  # QueueSize defines the number of test runs that are added to invoker and their resources are loading.
+  # The best value for this parameter is 1, but for slow networks it can be grater
+  QueueSize: 1
+  # SandboxType defines the type of sandbox used for process isolation. Possible values are "isolate" and "simple"
+  # It is strongly recommended to use "isolate" for safe process execution
+  SandboxType: "isolate"
+  # CacheSize defines the size of the cached files (in bytes). It is recommended to have it al least 10^9 or more.
+  CacheSize: 1000000000
+  # SaveOutputHead defines the number of bytes that should be saved for each resource, produced by solution.
+  # If this parameter is absent, the full content of each resource will be saved.
+  SaveOutputHead: 100
+  # SandboxHomePath is the path to directory for some sandbox specific files. This directory should be empty.
+  SandboxHomePath: "some path to empty directory"
+  # SandboxHomePath is the path to directory for cached files. This directory should be empty.
+  # The cache is reset at each invoker restart.
+  CachePath: "some cache path to empty directory"
+  # CompilerConfigsFolder is the path to directory, containing compiler configs (just like the folder configs/compiler)
+  CompilerConfigsFolder: "path to compiler configs"
+  # MasterPingInterval: 1s # The interval at which invoker pings master. By default, equal to 1s
+
+Master:
+  # InvokersPingInterval defines the interval at which invokers should be pinged.
+  InvokersPingInterval: 1s
+
+Storage:
+  # StoragePath defines the path to store all resources.
+  StoragePath: "some path to folder containing all the resources"
+
+DB:
+  Dsn: "postgresql://localhost:5432/ts" # Use your postgres dsn to connect to database.
+
+MasterConnection:
+  Address: "http://localhost:<port>" # Use the port that is defined in Port parameter for testing system.
+
+StorageConnection:
+  Address: "http://localhost:<port>" # Use the port that is defined in Port parameter for testing system.

readme.md

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+# Testing system
+
+This is a fast testing system for programming tasks.
+
+## Installation
+
+The testing system can be used at any linux repository. 
+
+You will need go 1.24 to build the testing system. 
+You will need postgres for database. 
+You will also need [isolate](https://github.com/ioi/isolate) for code isolation.
+
+To install testing system, download the repository. Then run command:
+
+```shell
+go build ./
+```
+
+To run the testing system, use command:
+
+```shell
+./testing_system <config.yaml file path>
+```
+
+There are two ways to configure testing system:
+
+- Single process run. For this configuration, use the file `configs/config-single-example.yaml` as a base for config. You can read the comments in config to configure testing system correctly.
+- Multiple server run. 
+For this configuration, there should be master server where the master component of testing system is set up, 
+and there can be multiple invoker servers for invokers.
+For config files, use `config/config-master-example.yaml` for master server config 
+and `config/config-invoker-example.yaml` for invoker server config.
+
+### Client configuration
+
+For client build, use command:
+
+```shell
+go build ./clients
+```
+
+To run the client, run compiled binary with config as a first argument. 
+The config can be produced from `configs/client-config-example.yaml`.
+
+### Polygon import
+
+To import problems from polygon, you can use `tools/polygon_importer`.
+It should be run with the following command:
+```shell
+polygon_importer <testing system config path> <polygon ID of problem> <polygon API key> <polygon API secret>
+```
+