Add some basic workflows (#36)

.github/workflows/close_invalid_prs.yml

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+# Thanks paper: https://github.com/papermc/paper/blob/master/.github/workflows/close_invalid_prs.yml
+name: Close invalid PRs
+
+on:
+  pull_request_target:
+    types: [ opened ]
+
+jobs:
+  run:
+    if: ${{ github.repository != github.event.pull_request.head.repo.full_name && github.head_ref == 'master' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: superbrothers/close-pull-request@v3
+        id: "master_branch"
+        if: github.head_ref == 'master'
+        with:
+          comment: |
+            Hi there! :wave: This PR is targeting the `master` branch, which is not allowed. Please target the `develop` branch instead. Thanks!

.github/workflows/test-pr.yml

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+name: Test PR
+on: [pull_request]
+jobs:
+  build_pr:
+    if: github.repository_owner == 'theEvilReaper'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v3
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+      - name: Build with ${{ matrix.os }}
+        run: |
+          git config --global user.email "no-reply@github.com"
+          git config --global user.name "Github Actions"
+          ./gradlew test