docs: Add README

README.md

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+# pybotx
+
+*A python library for building bots and smartapps for eXpress messenger.*
+
+[![PyPI version](https://badge.fury.io/py/botx.svg)](https://badge.fury.io/py/botx)
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/botx)
+[![Coverage](https://codecov.io/gh/ExpressApp/pybotx/branch/next/graph/badge.svg)](https://codecov.io/gh/ExpressApp/pybotx/branch/next)
+[![Code style](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
+
+
+## Features
+
+* Designed to be ease to use
+* Simple integration with async web-frameworks
+* Support middlewares for command, command-collector and bot
+* 100% test coverage
+* 100% type annotated codebase
+
+
+## Documentation
+
+*TODO: Add link*
+*TODO: Note that docs available only in Russian*
+
+
+## Installation
+
+Install pybotx using `pip`:
+
+```bash
+pip install git+https://github.com/ExpressApp/pybotx.git@next
+```
+
+*TODO: Add not about unstable version*
+
+
+## Usage example
+
+```python
+from http import HTTPStatus
+from uuid import UUID
+
+from botx import (
+    Bot,
+    BotAccountWithSecret,
+    ChatCreatedEvent,
+    HandlerCollector,
+    IncomingMessage,
+    build_command_accepted_response,
+)
+from fastapi import FastAPI, Request
+from fastapi.responses import JSONResponse
+
+collector = HandlerCollector()
+
+
+@collector.chat_created
+async def chat_created_handler(event: ChatCreatedEvent, bot: Bot) -> None:
+    await bot.answer_message("Hello!")
+
+
+@collector.command("/echo", description="Send back the received message body")
+async def echo_handler(message: IncomingMessage, bot: Bot) -> None:
+    await bot.answer_message(message.body)
+
+
+@collector.default_message_handler
+async def default_message_handler(event: IncomingMessage, bot: Bot) -> None:
+    await bot.answer_message("Sorry, command not found.")
+
+
+bot = Bot(
+    collectors=[collector],
+    bot_accounts=[
+        BotAccountWithSecret(  # Replace fake account credentials with yours
+            id=UUID("123e4567-e89b-12d3-a456-426655440000"),
+            host="cts.example.com",
+            secret_key="e29b417773f2feab9dac143ee3da20c5",
+        )
+    ],
+)
+
+app = FastAPI()
+app.add_event_handler("startup", bot.startup)
+app.add_event_handler("shutdown", bot.shutdown)
+
+
+@app.post("/command")
+async def command_handler(request: Request) -> JSONResponse:
+    bot.async_execute_raw_bot_command(await request.json())
+    return JSONResponse(
+        build_command_accepted_response(), status_code=HTTPStatus.ACCEPTED
+    )
+
+
+@app.get("/status")
+async def status_handler(request: Request) -> JSONResponse:
+    status = await bot.raw_get_status(dict(request.query_params))
+    return JSONResponse(status)
+
+
+@app.post("/notification/callback")
+async def callback_handler(request: Request) -> JSONResponse:
+    bot.set_raw_botx_method_result(await request.json())
+    return JSONResponse(
+        build_command_accepted_response(),
+        status_code=HTTPStatus.ACCEPTED,
+    )
+```