Update README.md
Add instructions of running Mojo shell, which are moved here from the chromium website.
diff --git a/README.md b/README.md
index dd2e004..f56f86b 100644
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@@ -150,3 +150,50 @@
```
$ ninja -C out/Debug -j 1000
```
+
+## Run Mojo Shell
+
+### On Android
+
+0. Prerequisites:
+ * Before you start, you'll need a device with an unlocked bootloader, otherwise you won't be able to run adb root (or any of the commands that require root). For Googlers, <a href="http://go/mojo-internal-build-instructions">follow this link</a> and follow the instructions before returning to this page.
+ * Ensure your device is running Lollipop and has an userdebug build.
+
+1. Build changed files:
+ ```
+ mojob.py build --android
+ ```
+
+2. Push mojo_shell to to your device:
+ ```
+ adb install -r out/android_Debug/apks/MojoShell.apk
+ ```
+
+3. Run Mojo Shell on the device:
+ ```
+ ./mojo/tools/android_mojo_shell.py mojo:sample_app
+ ```
+
+4. If you get a crash you won't see symbols. Use tools/android_stack_parser/stack to map back to symbols, e.g.:
+ ```
+ adb logcat | ./tools/android_stack_parser/stack
+ ```
+
+### On Linux and Windows
+
+1. Build the mojo target, which builds the shell and all examples:
+ ```
+ ninja -C out/Release mojo
+ ```
+
+2. Run Mojo Shell:
+ ```
+ ./out/Release/mojo_shell mojo:sample_app
+ ```
+
+3. Optional: Run Mojo Shell with an HTTP server
+ ```
+ cd out/Release
+ python -m SimpleHTTPServer 4444 &
+ ./mojo_shell --origin=http://127.0.0.1:4444 --disable-cache mojo:mojo_sample_app
+ ```
