Add travis

Copied from https://github.com/react-native-mapbox-gl/maps/blob/master/.travis.yml

.travil.yml

@@ -0,0 +1,78 @@
+matrix:
+  include:
+    - language: android
+      jdk: oraclejdk8
+      before_install:
+        - nvm install 8
+        - echo yes | sdkmanager "platforms;android-28"
+        - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.16.0
+        - export PATH=$HOME/.yarn/bin:$PATH
+      android:
+        components:
+          - tools
+          - platform-tools
+          - build-tools-28.0.3
+          - tools
+      cache:
+        bundler: true
+        yarn: true
+        directories:
+          - example/node_modules
+          - $HOME/.gradle/caches/
+          - $HOME/.gradle/wrapper/
+      before_cache:
+        - rm -f example/node_modules/react-native-openalpr/
+        - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+        - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+    - os: osx
+      osx_image: xcode10.2
+      node_js: 8
+      cache:
+        bundler: true
+        yarn: true
+        cocoapods: true
+        directories:
+          - example/node_modules
+          - $HOME/Library/Caches/Homebrew
+      before_cache:
+        - rm -f example/node_modules/react-native-openalpr/
+        - brew cleanup
+      podfile: example/ios/Podfile
+
+before_install:
+  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.16.0
+  - export PATH=$HOME/.yarn/bin:$PATH
+
+install:
+  - cd $TRAVIS_BUILD_DIR/example
+  - yarn install
+  - echo $TRAVIS_OS_NAME
+  - |
+    if [ "$TRAVIS_OS_NAME" == "osx" ]; then
+      cd $TRAVIS_BUILD_DIR/example/ios
+      pod install
+      pod update
+      gem install xcpretty
+    fi
+script:
+  - |
+    if [ "$TRAVIS_OS_NAME" == "osx" ]; then
+      cd $TRAVIS_BUILD_DIR/example/ios
+      set -o pipefail
+      rm -f build
+      xcodebuild -arch x86_64 -sdk iphonesimulator12.2  -workspace ./RNOpenALPRExample.xcworkspace -scheme RNOpenALPRExample | xcpretty -c
+    fi
+  - |
+    if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+      cd $TRAVIS_BUILD_DIR/example/android
+      TERM=dumb ./gradlew assemble
+    fi
+deploy:
+  provider: npm
+  email: [email protected]
+  api_key:
+    secure: TO-BE-ADDED-LATER
+  on:
+    tags: true
+    repo: robertsasak/react-native-openalpr
+    branch: master