Add readme

README.md

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+# PolyMC Meta
+Scripts to generate jsons and jars that PolyMC will access.
+
+## Usage
+
+### Install the dependencies
+
+As root:
+```
+sudo pip install requirements.txt
+```
+
+Or as user:
+```
+pip install --user requirements.txt
+```
+
+### Initial setup
+This will clone [meta-polymc](https://github.com/PolyMC/meta-polymc) and [meta-upstream](https://github.com/PolyMC/meta-upstream)
+
+```
+./clone.sh
+```
+
+### Generate files
+This will run the main script and do its magic
+
+```
+./update.sh
+```
+
+### Check status of meta-polymc and meta-upstream
+
+```
+./status.sh
+```