add first workflow (#45)

* add first workflow
* prepare cocoapods
add pod install step before running tests
* Install bundle dependencies
* fix test action failure
* improve test action
* cache cocoapods
* use latest cache action
* fix xcode warning

.github/workflows/continous-integration.yml

@@ -0,0 +1,25 @@
+name: Build and Test
+on: [push, pull_request]
+jobs:
+  iOS:
+      name: Test iOS
+      runs-on: macOS-latest
+      timeout-minutes: 15
+      steps:
+        - uses: actions/checkout@v2.3.2
+        - uses: actions/cache@v2.1.1
+          id: load-cache
+          with:
+            path: Example/Pods
+            key: macos-pods-${{ hashFiles('**/Podfile.lock') }}
+        - name: Install Cocoapods dependencies
+          if: steps.load-cache.outputs.cache-hit != 'true'
+          run: pod install --project-directory=Example
+        - name: All Tests
+          uses: sersoft-gmbh/xcodebuild-action@v1.1
+          with:
+            workspace: Example/PerspectiveTransform.xcworkspace
+            scheme: Example
+            destination: platform=iOS Simulator,name=iPhone 11 Pro
+        - name: Report coverage
+          run: bash <(curl -s 'https://codecov.io/bash') -Z -J '^PerspectiveTransform$' -X gcov -X fix