Simple README added

Author: vgvoleg

README.md

@@ -0,0 +1,47 @@
+# YDB Python DBAPI
+
+## Introduction
+
+Python DBAPI to `YDB`, which provides both sync and async drivers and complies with [PEP249](https://www.python.org/dev/peps/pep-0249/).
+
+## Installation
+
+**TBD after first release**
+
+## Usage
+
+To establish a new DBAPI connection you should provide `host`, `port` and `database`:
+
+    ```python
+    import ydb_dbapi
+
+    connection = ydb_dbapi.connect(
+        host="localhost", port="2136", database="/local"
+    ) # sync connection
+
+    async_connection = await ydb_dbapi.async_connect(
+        host="localhost", port="2136", database="/local"
+    ) # async connection
+    ```
+
+Usage of connection:
+
+    ```python
+    with connection.cursor() as cursor:
+        cursor.execute("SELECT id, val FROM table")
+
+        row = cursor.fetchone()
+        rows = cursor.fetchmany(size=5)
+        rows = cursor.fetchall()
+    ```
+
+Usage of async connection:
+
+    ```python
+    async with async_connection.cursor() as cursor:
+        await cursor.execute("SELECT id, val FROM table")
+
+        row = await cursor.fetchone()
+        rows = await cursor.fetchmany(size=5)
+        rows = await cursor.fetchall()
+    ```