add configuration file for CircleCI

use ubuntu trusty environment
build only master and develop (using cmake)
extend time with no output (e.g. template generation) to 30m (avoid
hangup error)

.circleci/config.yml

@@ -0,0 +1,26 @@
+version: 2
+jobs:
+  build:
+    branches:
+      only:
+        - master
+        - develop
+
+    docker:
+      - image: ubuntu:trusty
+
+    steps:
+      - checkout
+
+      - run:
+          name: Install package dependencies
+          command: sudo apt-get update && sudo apt-get install -y build-essential cmake openmpi-bin libopenmpi-dev python-dev libvtk6 libvtk6-dev
+
+      - run:
+          name: Configure LIGGGHTS build
+          command: mkdir -p build && cd build && cmake ../src/
+
+      - run:
+          name: Build LIGGGHTS
+          command: cd build && make -j2
+          no_output_timeout: 30m