Add new workflows and prettier config/ignore

Author: phrdang

.github/workflows/java-checkstyle.yml

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+# Uses: https://github.com/marketplace/actions/run-java-checkstyle
+# Submits review annotations based on checkstyle errors
+name: Java (Checkstyle)
+
+on: pull_request
+
+jobs:
+  lint-java:
+    name: Lint Java with checkstyle
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out Git repository
+      uses: actions/checkout@v2
+      
+    - name: Setup Java JDK
+      uses: actions/[email protected]
+      with:
+        java-version: '12.x'
+
+    - name: Run checkstyle with reviewdog
+      uses: nikitasavinov/[email protected]
+      with:
+        # Report reviewdog results to
+        # GitHub PullRequest review comments
+        # using GitHub Personal API Access Token
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        reporter: github-pr-review

.github/workflows/java-prettier.yml

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+# Uses: https://github.com/marketplace/actions/prettier-java-action
+# Auto formats code using Prettier
+name: Java (Prettier)
+
+on: pull_request
+
+jobs:
+  prettify:
+    name: Prettify Java
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out Git repository
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+      
+    - name: Prettify the Java code
+      uses: lwerner-lshigh/[email protected]
+      with:
+      ### Prettier Options ###
+      # --no-semi overrides prettier printing semicolons
+      # at the ends of all statements
+      # --tab-width 4 sets the tab width to 4 spaces
+      # --write *.java formats all .java files
+        prettier_options: '--no-semi --tab-width 4 --write **/*.java'
+        branch: ${{ github.head_ref }}
+        commit_message: 'Bot: Prettified Java code!'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/main.yml

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+# Ignore workflow files
+*.yml
+
+# Ignore markdown files
+*.md

.prettierignore

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+{
+    "tabWidth": 4,
+    "semi": false,
+    "bracketSpacing": false
+}