[Android] Add partial md documentation for instrumentation test features.

testing/android/docs/index.md

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+# Android Testing in Chromium
+
+## How do I...
+
+  - **set up**
+    - [... set up a device for local testing?](/testing/android/docs/todo.md)
+    - [... set up an emulator for local testing?](/testing/android/docs/todo.md)
+  - **writing tests**
+    - [... write an instrumentation test?](/testing/android/docs/instrumentation.md)
+    - [... write a Robolectric test?](/testing/android/docs/todo.md)
+  - **running tests**
+    - [... run a gtest?](/testing/android/docs/todo.md)
+    - [... run an instrumentation test?](/testing/android/docs/todo.md)
+    - [... run a Robolectric test?](/testing/android/docs/todo.md)
+    - [... run the blink layout tests?](https://sites.google.com/a/chromium.org/dev/developers/testing/webkit-layout-tests)
+    - [... run a telemetry test?](/testing/android/docs/todo.md)
+  - **miscellaneous**
+    - [... use code coverage for Java tests?](/build/android/docs/coverage.md)
+
+## How does it work on Android?
+
+  - [c++ browser tests](/testing/android/docs/todo.md)
+  - [c++ unit tests](/testing/android/docs/todo.md)
+  - [instrumentation tests](/testing/android/docs/todo.md)
+  - [junit tests](/testing/android/docs/todo.md)