Add contribute script and Pull request template

Author: cjam

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,16 @@
+Fixes # .
+
+Changes introduced in this pull request:
+
+- 
+- 
+- 
+- 
+
+## Tasks 
+- [ ] Add yourself as contributor via `yarn contribute`
+- [ ] Update `Unreleased` section of  `CHANGELOG.md` with changes ([Convention](https://keepachangelog.com/en/1.0.0/))
+
+
+@cjam
+

package.json

@@ -48,7 +48,8 @@
     "submodules": "rm -rf ios/external/* && rm -rf android/external/* && git submodule update --init --recursive",
     "example": "concurrently -n \"server,packager\" -c \"yellow,cyan\" \"cd example-server && yarn start\" \"cd example && yarn start\"",
     "xcode": "open example/ios/example.xcworkspace",
-    "release": "release-it"
+    "release": "release-it",
+    "contribute": "all-contributors add && all-contributors generate"
   },
   "peerDependencies": {
     "react-native": ">=0.60"