Switch to build.gradle, reformat code using Spotless (#66)

The switch to the Groovy DSL will make it easier for maintainability, since it has more documentation. 
detekt was abandoned for Spotless because Spotless contains an autoformatter.

Author: prateekma

LicenseHeader.txt

@@ -0,0 +1,8 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2019, Green Hope Falcons
+ */
+

azure-pipelines.yml

@@ -8,14 +8,14 @@ pool:
 
 steps:
 
-- task: Gradle@2
-  inputs:
-    workingDirectory: ''
-    gradleWrapperFile: 'gradlew'
-    gradleOptions: '-Xmx3072m'
-    javaHomeOption: 'JDKVersion'
-    jdkVersionOption: '1.11'
-    jdkArchitectureOption: 'x64'
-    publishJUnitResults: false
-    testResultsFiles: '**/TEST-*.xml'
-    tasks: 'build'
+  - task: Gradle@2
+    inputs:
+      workingDirectory: ''
+      gradleWrapperFile: 'gradlew'
+      gradleOptions: '-Xmx3072m'
+      javaHomeOption: 'JDKVersion'
+      jdkVersionOption: '1.11'
+      jdkArchitectureOption: 'x64'
+      publishJUnitResults: false
+      testResultsFiles: '**/TEST-*.xml'
+      tasks: 'build'