docs: add readme for the project

README.md

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+# GADGETS INFO MINI APP
+
+See demo here: https://t.me/gadgets_info_bot
+
+## Description
+
+Gadgets info mini app is a place where you can find all technical info about any gadget and also compare them to each other.
+
+## Current features
+
+- search gadgets through mock and filter them by name or brand data
+- see gadget detailed technical info
+- compare technical info between two selected gadgets
+
+## Next features
+
+- build and integrate backend
+- improve UI/UX
+- integrate `docker`
+
+## Setup guide
+
+**NOTE: To setup mini app started on local machine must be used test environment. Read more about [here](https://core.telegram.org/bots/webapps#testing-mini-apps)**
+
+- Build and deploy the app to any static host or run it on local machine following the instruction - [README.md](./app/README.md)
+- Open [BotFather](https://t.me/BotFather)
+- Create a bot using `/newbot` command
+- Link the app url to the bot menu button following next steps:
+  1. Use `/mybots` command
+  2. Select created bot > `Bot settings` > `Menu button` > `Configure menu button`
+  3. Follow bot instructions
+- Done! Open your bot and enjoy!