Add README

Author: mariusnita

README.md

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+# Hyperdiv Docs
+
+This repo contains the Hyperdiv documentation app, which is written in Hyperdiv.
+
+![hyperdiv-docs](https://github.com/hyperdiv/hyperdiv-docs/assets/5980501/6184856b-fb25-40d0-a3ae-08281fd01ca9)
+
+# Opening the Documentation App
+
+The documentation app ships with Hyperdiv when installing Hyperdiv from PyPI. After installing Hyperdiv, run this command to open the docs app in a browser tab:
+```
+hyperdiv docs
+```
+
+# For Developers
+
+After cloning the Hyperdiv repo and installing its dependencies, you can simply clone this repo and run its `start.py` script within Hyperdiv's Poetry virtualenv:
+```sh
+cd hyperdiv
+# Install dependencies
+poetry install
+# Enter the virtualenv
+poetry shell
+# Run the docs app in the virtualenv
+cd ../hyperdiv-docs
+python start.py
+```