write usable readme

README.md

@@ -1 +1,41 @@
 # mojave-permissions
+
+This is native nodejs module that implements access to `getMediaAccessStatus` and `askForMediaAccess` functions introduced in macOS Mojave 10.14.
+
+## Building
+
+```
+node-gyp configure
+node-gyp build
+```
+
+And you can check if it works:
+```
+node test.js
+```
+
+Tested on macOS 10.14 and 10.13 with nodejs 11.3.0 and Electron 1.8.8 (node 8.2.1).
+
+## API
+
+### getMediaAccessStatus(mediaType)
+
+**mediaType** is a string and can be `microphone` or `camera`
+
+Returns one of the following values: `not-determined`, `restricted`, `denied` or `granted`
+
+### askForMediaAccess(mediaType, callback)
+
+Asks user for media access and returns user choice to the callback. Example:
+
+```
+mojavePermissions.askForMediaAccess('camera', (granted) => {
+  if (!granted) {
+    // user has denied access to camera
+  }
+})
+```
+
+## License
+
+I don't care; you can use it however you want.