Update README.md

Author: gridnevvvit

README.md

@@ -6,3 +6,32 @@ YDB Python SDK
 [![Style checks](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/style.yaml/badge.svg)](https://github.com/ydb-platform/ydb-python-sdk/actions/workflows/style.yaml)
 
 Officially supported Python client for YDB.
+
+## Quickstart
+
+### Prerequisites
+
+- Python 3.5 or higher
+- `pip` version 9.0.1 or higher
+
+If necessary, upgrade your version of `pip`:
+
+```sh
+$ python -m pip install --upgrade pip
+```
+
+If you cannot upgrade `pip` due to a system-owned installation, you can
+run the example in a virtualenv:
+
+```sh
+$ python -m pip install virtualenv
+$ virtualenv venv
+$ source venv/bin/activate
+$ python -m pip install --upgrade pip
+```
+
+Install YDB python sdk:
+
+```sh
+$ python -m pip install ydb
+```