Add main Github Actions workflow

.github/workflows/main.yaml

@@ -0,0 +1,30 @@
+name: PlatformIO CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install platformio
+    - name: Run PlatformIO Build
+      run: platformio run --environment nrf52840_dk
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+        uses: actions/setup-python@v1
+    - name: Install dependencies
+        run: |
+        python -m pip install --upgrade pip
+        pip install platformio
+    - name: Run PlatformIO Tests
+      run: platformio test --environment desktop

README.md

@@ -2,6 +2,8 @@
 
 **Contributions Welcome!** 
 
+[![Actions Status](https://github.com/CovidBraceletPrj/CovidBracelet/workflows/main/badge.svg)](https://github.com/CovidBraceletPrj/CovidBracelet/actions)
+
 ## Features
 *  Sends and receives exposure beacons as specified by Google and Apple for Covid Contact Tracing
   * Rolling, encrypted, anonymous beacons