move the docs from the wiki to the codebase/repo

Author: patrickdevivo

docs/API.md

@@ -0,0 +1,30 @@
+## API
+
+If you'd like to access tickgit information about public `git` repositories, you can use our API.
+
+### TODOs
+
+`GET` requests to `https://tickgit.augmentable.dev/todos` with the `repo` query param populated with the URL of a git repo, like so:
+
+```
+https://tickgit.augmentable.dev/todos?repo=https://github.com/facebook/react
+```
+Will return a simple JSON response:
+
+```
+{"todos":125}
+```
+
+Indicating the total count of TODOs found in the `HEAD` of that repository.
+
+_more coming soon!_
+
+### TODOs Badge
+
+Similarly, `GET` requests to `https://tickgit.augmentable.dev/todos-badge` with the same `repo` query param:
+
+```
+http://tickgit.augmentable.dev/todos-badge?repo=https://github.com/facebook/react
+```
+
+Will return JSON that can be fed into a shields.io badge: [https://shields.io/endpoint](https://shields.io/endpoint)