add a readme

README.md

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+# .macoscompose
+
+this lets you write compose key config in a simple yaml-like format.
+
+the setup is just like that on
+[gnarf's osx-compose-key repo](https://github.com/gnarf/osx-compose-key) except
+you don't need to download or install it, instead you can make a `.macoscompose`
+file in your `$HOME` and populate it in a manner similar to this:
+
+```yaml
++1: 👍
+-1: 👎
+
+# hearts
+heart: ❤
+"yellow heart": 💛
+
+dog: 🐶
+"(:": ������
+```
+
+then run `node .` in this directory (once you've `npm install`'d) and restart
+the apps you want to use compose key in.
+
+## something like this:
+
+```sh
+git clone https://gitlab.com/chee/macoscompose
+cd macoscompose
+cp example.macoscompose ~/.macoscompose
+npm install
+node .
+```
+
+## todo
+
+* add more entries to the example
+* fill out the rest of the todo section