Update README.md

Author: chinmaygarde

README.md

@@ -3,11 +3,40 @@ Flutter Wayland
 
 A Flutter Embedder that talks to Wayland.
 
-Setup Instructions
-------------------
+Build Setup Instructions
+------------------------
 
 * Install the following packages (on Debian Stretch): `weston`, `libwayland-dev`, `cmake` and `ninja`.
 * From the source root `mkdir build` and move into the directory.
 * `cmake -G Ninja ../`. This should check you development environment for required packages, download the Flutter engine artifacts and unpack the same in the build directory.
 * `ninja` to build the embedder.
-* Run the embedder using `./flutter_wayland`. Make sure `weston` is running.
+* Run the embedder using `./flutter_wayland`. Make sure `weston` is running. See the instructions on running Flutter applications below.
+
+Running Flutter Applications
+----------------------------
+
+```
+Flutter Wayland Embedder
+========================
+
+Usage: `flutter_wayland <asset_bundle_path> <flutter_flags>`
+
+This utility runs an instance of a Flutter application and renders using
+Wayland core protocols.
+
+The Flutter tools can be obtained at https://flutter.io/
+
+asset_bundle_path: The Flutter application code needs to be snapshotted using
+                   the Flutter tools and the assets packaged in the appropriate
+                   location. This can be done for any Flutter application by
+                   running `flutter build bundle` while in the directory of a
+                   valid Flutter project. This should package all the code and
+                   assets in the "build/flutter_assets" directory. Specify this
+                   directory as the first argument to this utility.
+
+    flutter_flags: Typically empty. These extra flags are passed directly to the
+                   Flutter engine. To see all supported flags, run
+                   `flutter_tester --help` using the test binary included in the
+                   Flutter tools.
+
+```