Add README explaining the purpose of the repo (#1)

Co-authored-by: openhands <[email protected]>

README.md

@@ -0,0 +1,8 @@
+# OpenHands Sandbox
+
+## Purpose
+The OpenHands Sandbox repository contains business code for nicebots.xyz. It is used in conjunction with [OpenHands](https://github.com/All-Hands-AI/OpenHands/) to integrate OpenHands with our developer workflow tools at nicebots.xyz.
+
+## Key Components
+- **Dockerfile**: Sets up the environment with necessary tools and utilities.
+- **Utilities**: Includes `uv`, `pdm`, and `copywrite` for package management and other functionalities.