Added boilerplate code that includes refactoring miner & git4idea dep…

…endencies, .gitignore and .yml files.

.gitignore

@@ -0,0 +1,3 @@
+/.idea/
+/.gradle/
+/build/

.gitlab-ci.yml

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+image: gradle:6.0-jdk13
+
+stages:
+  - build
+  - validate
+#  - test
+#  - coverage
+
+variables:
+  # Disable the Gradle daemon to ensure isolated runs of the CI pipeline.
+  GRADLE_OPTS: "-Dorg.gradle.daemon=false"
+
+before_script:
+  - export GRADLE_USER_HOME=`pwd`/.gradle
+
+build:
+  stage: build
+  script:
+    gradle --build-cache assemble
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: push
+    paths:
+      - build/
+      - .gradle/
+
+checkStyle:
+  stage: validate
+  script: gradle checkstyleMain checkstyleTest
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: pull
+    paths:
+      - build/
+      - .gradle/
+#
+#test:
+#  stage: test
+#  artifacts:
+#    untracked: true
+#  script:
+#    gradle check
+#
+#coverage:
+#  stage: coverage
+#  dependencies:
+#    - test
+#  script:
+#    - coverage=$(awk -F"," '{ branches += $6 + $7; covered += $7 } END { print "Total" ,int(100*covered/branches), "%% covered" }' build/JaCoCo/test/jacocoTestReport.csv)
+#    # - aggregate=$(awk -F"," '{ branches += $6 + $7; covered += $7 } END { print "\nAGGREGATE COVERAGE REPORT"; print covered, "/", branches, "branches covered"; print int(100*covered/branches), "%% covered\n---------------------------\n" }' target/site/jacoco-aggregate/jacoco.csv)
+#    - printf "$coverage"
+#  coverage: '/Total *?([0-9]{1,3}) %/'

build.gradle

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+plugins {
+    id 'java'
+    id 'checkstyle'
+    id 'jacoco'
+    id 'org.jetbrains.intellij' version '0.4.18'
+    id 'org.jetbrains.kotlin.jvm' version '1.3.72'
+}
+
+group 'org.example'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+
+test {
+    useJUnitPlatform()
+}
+
+jacocoTestReport {
+    reports {
+        xml.enabled true
+        csv.enabled false
+        html.destination file("${buildDir}/jacocoHtml")
+    }
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
+    implementation files('lib/RefactoringMiner.jar')
+}
+
+// See https://github.com/JetBrains/gradle-intellij-plugin/
+intellij {
+    version '2020.1'
+    plugins 'java', 'git4idea'
+}
+
+
+checkstyle {
+    toolVersion "8.25"
+    configFile = rootProject.file('config/checkstyle/checkstyle.xml')
+}
+compileKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+compileTestKotlin {
+    kotlinOptions.jvmTarget = "1.8"
+}
+kotlin {
+    /* Targets configuration omitted. 
+    *  To find out how to configure the targets, please follow the link:
+    *  https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#setting-up-targets */
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation kotlin('stdlib-common')
+            }
+        }
+        commonTest {
+            dependencies {
+                implementation kotlin('test-common')
+                implementation kotlin('test-annotations-common')
+            }
+        }
+    }
+}
+patchPluginXml {
+    changeNotes """
+      Add change notes here.<br>
+      <em>most HTML tags may be used</em>"""
+}