Added GH workflow for building

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: build
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: Set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 21
+          check-latest: true
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Upload Artifacts to GitHub
+        uses: actions/upload-artifact@v3
+        with:
+          name: Artifacts
+          path: build/libs/

README.md

@@ -27,7 +27,7 @@ ViaProxy supports joining to any of the listed server version from any of the li
 
 ## Releases
 ### Executable Jar File
-If you want the executable jar file you can download a stable release from [GitHub](https://github.com/ViaVersion/ViaProxy/releases/latest) or the latest dev version from this [Jenkins](https://ci.viaversion.com/view/All/job/ViaProxy/).
+If you want the executable jar file you can download a stable release from [GitHub Releases](https://github.com/ViaVersion/ViaProxy/releases/latest) or the latest dev version from [GitHub Actions](https://github.com/RaphiMC/ViaProxy/actions/workflows/build.yml) or the [ViaVersion Jenkins](https://ci.viaversion.com/view/All/job/ViaProxy/).
 
 ### Gradle/Maven
 To use ViaProxy with Gradle/Maven you can use the ViaVersion maven server:
@@ -37,7 +37,7 @@ repositories {
 }
 
 dependencies {
-    implementation("net.raphimc:ViaProxy:3.0.19") // Get latest version from releases
+    implementation("net.raphimc:ViaProxy:x.x.x") // Get latest version from releases
 }
 ```
 
@@ -53,7 +53,7 @@ dependencies {
     <dependency>
         <groupId>net.raphimc</groupId>
         <artifactId>ViaProxy</artifactId>
-        <version>3.0.19</version> <!-- Get latest version from releases -->
+        <version>x.x.x</version> <!-- Get latest version from releases -->
     </dependency>
 </dependencies>
 ```