Android share extension (#1352)

* Android share extension

* Feedback review

* Feedback review

android/app/src/main/java/com/mattermost/share/SharePackage.java

@@ -0,0 +1,27 @@
+package com.mattermost.share;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.JavaScriptModule;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.uimanager.ViewManager;
+import com.facebook.react.ReactPackage;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class SharePackage implements ReactPackage {
+    @Override
+    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+        return Arrays.<NativeModule>asList(new ShareModule(reactContext));
+    }
+
+    public List<Class<? extends JavaScriptModule>> createJSModules() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+}