Add base docs page (WIP)

Author: joserebelo

docs/CONTENT_PROVIDER.md

@@ -0,0 +1,25 @@
+# Content Provider
+
+## Authority
+
+The authority for this content provider follows `<package_name>.contentprovider.cards`
+
+| Release Channel | Package Name                |
+|-----------------|-----------------------------|
+| Google Play     | me.hackerchick.catima       |
+| F-Droid         | me.hackerchick.catima       |
+| Debug Build     | me.hackerchick.catima.debug |
+
+## Permissions
+
+- `me.hackerchick.catima.READ_CARDS`
+
+## URIs
+
+### version
+
+### cards
+
+### groups
+
+### card_groups