[skip ci] Create build from source doc

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install.md

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+# Install Milvus from Source Code
+
+## Software requirements
+
+- Ubuntu 18.04 or higher
+- CMake 3.14 or higher
+- CUDA 10.0 or higher
+- NVIDIA driver 418 or higher
+
+## Compilation
+
+### Step 1 Install dependencies
+
+```shell
+$ cd [Milvus sourcecode path]/core
+$ ./ubuntu_build_deps.sh
+```
+
+### Step 2 Build
+
+```shell
+$ cd [Milvus sourcecode path]/core
+$ ./build.sh -t Debug
+or 
+$ ./build.sh -t Release
+```
+
+When the build is completed, all the stuff that you need in order to run Milvus will be installed under `[Milvus root path]/core/milvus`.
+
+## Launch Milvus server
+
+```shell
+$ cd [Milvus root path]/core/milvus
+```
+
+Add `lib/` directory to `LD_LIBRARY_PATH`
+
+```
+$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/path/to/milvus/lib
+```
+
+Then start Milvus server:
+
+```
+$ cd scripts
+$ ./start_server.sh
+```
+
+To stop Milvus server, run:
+
+```shell
+$ ./stop_server.sh
+```