Add simulated parking capacity and Jenkins CI (refs #9)

Jenkinsfile

@@ -0,0 +1,34 @@
+pipeline {
+    agent any
+
+    options {
+        skipDefaultCheckout()
+        disableConcurrentBuilds()
+        timeout(time: 10, unit: 'MINUTES')
+        buildDiscarder(logRotator(numToKeepStr: '10'))
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+                sh 'git rev-parse HEAD'
+            }
+        }
+        stage('Compile and lint') {
+            steps {
+                sh '''
+                    mkdir -p build/classes
+                    javac -Xlint:all -Werror -d build/classes \
+                      src/main/java/edu/stevens/smartpark/ParkingLot.java \
+                      src/test/java/edu/stevens/smartpark/ParkingLotTest.java
+                '''
+            }
+        }
+        stage('Unit tests') {
+            steps {
+                sh 'java -cp build/classes edu.stevens.smartpark.ParkingLotTest'
+            }
+        }
+    }
+}