docs(expo): explain how to migrate to and from expo camera module (#1605

)

.github/ISSUE_TEMPLATE.md

@@ -1,8 +1,5 @@
 ### Warning
-RCTCamera is **DEPRECATED** on v1.0.0 follow our migration guide here https://github.com/react-native-community/react-native-camera/blob/master/docs/migration.md
-
-### Gradle 3
-This package required Gradle 3, follow this migration guide https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration
+RCTCamera is **DEPRECATED** on v1.0.0 follow our [Migration guide](https://github.com/react-native-community/react-native-camera/blob/master/docs/migration.md)
 
 ### Which implementation are you using
 
@@ -14,7 +11,7 @@ This package required Gradle 3, follow this migration guide https://developer.an
 3.
 
 ### Does it work with Expo Camera?
-RNCamera is based on Expo Camera, if this does not work with Expo Camera it won't work with RNCamera as well.
+Check usage with Expo - https://github.com/react-native-community/react-native-camera/blob/master/docs/Expo_Usage.md
 You should open an issue there as well, so we can cooperate in a solution.
 
 ### Expected behaviour
@@ -24,7 +21,6 @@ Tell us what should happen
 Tell us what happens instead
 
 ### Environment
-- **Node.js version**:
 - **React Native version**:
 - **React Native platform + platform version**: iOS 9.0, Android 5.0, etc
 

docs/Expo_Usage.md

@@ -0,0 +1,31 @@
+# [Expo](https://expo.io/) Usage
+
+RNCamera of react-native-camera is heavyly based on Expo camera module. Thanks @aalices and Expo for the great work.
+
+So you don't need to use **react-native-camera** if you have the following config:
+
+- If you are using [Expo](https://expo.io)
+- If you are using [create-react-native-app](https://github.com/react-community/create-react-native-app)
+- If you eject a [create-react-native-app](https://github.com/react-community/create-react-native-app) app and are using [ExpoKit](https://docs.expo.io/versions/latest/expokit/expokit)
+
+## How to migrate from Expo to react-native-camera
+
+If you decide to eject without using ExpoKit, you can follow react-native-camera installation instructions and just change the usage of your Camera component to RNCamera:
+
+```diff
+- import { Camera } from 'expo';
++ import { RNCamera } from 'react-native-camera';
+
+- <Camera
++ <RNCamera
+```
+
+## How to migrate from react-native-camera to Expo Camera Module
+```diff
+- import { RNCamera } from 'react-native-camera';
++ import { Camera } from 'expo';
+
+- <RNCamera
++ <Camera
+```
+