Added a new line linter

.github/workflows/code-hygiene.yml

@@ -0,0 +1,14 @@
+name: Code Hygiene
+
+on: [pull_request]
+
+jobs:
+  linelint:
+    runs-on: ubuntu-latest
+    name: Check if all files end in newline
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Linelint
+        uses: fernandrone/linelint@0.0.4

.linelint.yml

@@ -0,0 +1,19 @@
+# 'true' will fix files
+autofix: true
+
+ignore:
+  - CONTRIBUTING.md
+  - DEVELOPER_GUIDE.md
+  - SECURITY.md
+  - formatter/license-header.txt
+  - settings.gradle
+  - src/main/resources/log4j2.xml
+
+rules:
+  # checks if file ends in a newline character
+  end-of-file:
+    # set to true to enable this rule
+    enable: true
+
+    # if true also checks if file ends in a single newline character
+    single-new-line: true