Editor config and annotations (#738)

* Add annotations support

* Add appropriate .editorconfig

.editorconfig

@@ -0,0 +1,12 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root=true
+
+[*]
+charset=utf-8
+# Unix-style newlines with a newline ending every file
+end_of_line=lf
+insert_final_newline=true
+indent_style=tab
+tab_width=4

README.md

@@ -48,7 +48,7 @@ Contributing code
 ---------------
 * A list of open issues can be found at the [issue tracker][2]
 * Features we would like to see (but nobody started working on them yet) have the [patches-welcome][3] label attached to them. Please let us know if you start working on such an open issue (to avoid duplicate work)
-* We accept raw patches and github pull request - and we use tabs.
+* We accept raw patches and github pull request - and we use tabs (if your editor understands .editorconfig, it will help you enforce this).
 
 Building
 ========

app/build.gradle

@@ -25,3 +25,7 @@ android {
         abortOnError false
     }
 }
+
+dependencies {
+    compileOnly 'com.android.support:support-annotations:27.0.2'
+}