add readme

Author: apple1417

Readme.md

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+# BL2 / TPS / AoDK PythonSDK Mod Manager
+[![Support Discord](https://img.shields.io/static/v1?label=&message=Support%20Discord&logo=discord&color=424)](https://discord.gg/bXeqV8Ef9R)
+[![Developer Discord](https://img.shields.io/static/v1?label=&message=Developer%20Discord&logo=discord&color=222)](https://discord.gg/VJXtHvh)
+
+The [PythonSDK](https://github.com/bl-sdk/PythonSDK) Mod Manager for:
+- Borderlands 2
+- Borderlands: The Pre-Sequel
+- Tiny Tina’s Assault on Dragon Keep: A Wonderlands One-shot Adventure
+
+Replaces the `Downloadable Content` tab on the main menu with a new `Mods` menu.
+
+### [For installation instructions, see the project site.](https://bl-sdk.github.io/)