[NEW] Share extension (#942)

__mocks__/react-native-realm-path.js

android/app/build.gradle

android/app/src/main/AndroidManifest.xml

...rc/main/java/chat/rocket/reactnative/MainApplication.java

...ain/java/chat/rocket/reactnative/share/ShareActivity.java

.../java/chat/rocket/reactnative/share/ShareApplication.java

android/app/src/main/res/values/strings.xml

android/app/src/main/res/values/styles.xml

android/settings.gradle

app.json

app/constants/settings.js

app/containers/HeaderButton.js

app/containers/RoomTypeIcon.js

app/i18n/locales/en.js

app/i18n/locales/pt-BR.js

app/index.js

app/lib/realm.js

app/lib/rocketchat.js

app/presentation/DirectoryItem/index.js

app/presentation/DirectoryItem/styles.js