added all the code.

build.gradle

@@ -0,0 +1,60 @@
+plugins {
+    id 'net.fabricmc.fabric-loom-remap' version "${loom_version}"
+    id 'maven-publish'
+}
+
+version = project.mod_version
+group = project.maven_group
+
+base {
+    archivesName = project.archives_base_name
+}
+
+repositories {
+    mavenCentral()
+}
+
+loom {
+    splitEnvironmentSourceSets()
+
+    mods {
+        "sign-leak-shield" {
+            sourceSet sourceSets.main
+            sourceSet sourceSets.client
+        }
+    }
+}
+
+dependencies {
+    minecraft "com.mojang:minecraft:${project.minecraft_version}"
+    mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+    modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+}
+
+processResources {
+    inputs.property "version", project.version
+
+    filesMatching("fabric.mod.json") {
+        expand "version": inputs.properties.version
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    it.options.release = 21
+}
+
+java {
+    withSourcesJar()
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+}
+
+publishing {
+    publications {
+        create("mavenJava", MavenPublication) {
+            artifactId = project.archives_base_name
+            from components.java
+        }
+    }
+}