Add github actions for simple CI (MIT-SPARK#7)

.github/workflows/main.yml

@@ -0,0 +1,40 @@
+name: build 
+
+on: 
+  push:
+    branches: 
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+
+  build-debug:
+    name: CMake Debug Build
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: install-eigen
+      run: sudo apt install libeigen3-dev
+    - name: configure
+      run: mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug ..
+    - name: build
+      run: cmake --build build
+
+  build-release:
+    name: CMake Release Build
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: install-eigen
+      run: sudo apt install libeigen3-dev
+    - name: configure
+      run: mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release ..
+    - name: build
+      run: cmake --build build
+    - name: test
+      run: cd build && ctest all
+

README.md

@@ -1,4 +1,6 @@
 # TEASER++
+![](https://github.com/MIT-SPARK/TEASER-plusplus/workflows/build/badge.svg)
+
 TEASER++ is a fast and robust point cloud registration framework written in C++. It can solve the rigid body transformation problem between two point clouds in 3D. TEASER++ also has bindings for MATLAB and Python, as well as integration with ROS for easy testing and visualization.   
 
 ![](doc/banner.png)