Add Ponder as git submodule and create CI build workflow

Co-authored-by: dmccoystephenson <21204351+dmccoystephenson@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yml

@@ -0,0 +1,33 @@
+name: Build
+
+on:
+  push:
+    branches: [ main, develop, copilot/** ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Set up JDK 8
+      uses: actions/setup-java@v4
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+        cache: maven
+
+    - name: Build and install Ponder to local Maven repository
+      run: |
+        cd dependencies/Ponder
+        chmod +x gradlew
+        ./gradlew build publishToMavenLocal -x test
+
+    - name: Build SimpleSkills with Maven
+      run: mvn clean compile --batch-mode --update-snapshots

.gitmodules

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+[submodule "dependencies/Ponder"]
+	path = dependencies/Ponder
+	url = https://github.com/Preponderous-Software/Ponder.git