Add README for Badgeware contributions

Added instructions for downloading and contributing apps to Badgeware.

Author: helgibbons

README.md

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+# Badgeware Contributions
+
+This repo is the home for **extra** Badgeware apps - community contributions and a few of our own that didn't quite fit into the shipping firmware. If you're looking for inspiration or if you've built a cool app and want to share it with other badgeware users, you're in the right place!
+
+If you're looking for the shipping firmware and examples, you can find them at the links below:
+
+- [Badger 2350](https://github.com/pimoroni/badger2350)
+- [Tufty 2350](https://github.com/pimoroni/tufty2350)
+- [Blinky 2350](https://github.com/pimoroni/blinky2350)
+
+If you want to learn more about Badgeware (or would like to buy a badge of your own) check out [badgewa.re](https://badgewa.re/)!
+
+## How to download an app to your badge
+
+1) Download this repo (either via `git clone https://github.com/pimoroni/badgeware-contrib` or by clicking the dropdown on the 'Code' button on the front page, and clicking 'Download ZIP')
+2) Double press the 'RESET' button on your badge to put it into Disk Mode
+3) Find the app you want in the downloaded repo
+4) Copy the directory into the 'apps' directory on the BADGER/TUFTY/BLINKY drive.
+5) Eject the badge from your computer once the files have finished copying
+6) The new app should now be showing in the launcher.
+
+## How to add a new app to this repo
+
+1) Fork this repo
+2) Create a new directory in your fork for your app
+3) Add your app `__init__.py` to the directory. Don't forget to include a 24x24 icon for the launcher!
+4) Submit a Pull Request back to this repo
+5) Make more apps! 🎉