Create nms for 1.18 to 1.21.

Not tested for most version but should work as expected. will test for most versions before release.

nms/v1_20R3/build.gradle.kts

@@ -0,0 +1,43 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+group = rootProject.group
+version = rootProject.version
+
+plugins {
+    id("io.papermc.paperweight.userdev")
+}
+
+dependencies {
+    implementation(project(":nms:nms-common"))
+
+    // Used for nms
+    paperweight.paperDevBundle("1.20.4-R0.1-SNAPSHOT")
+}
+
+repositories {
+    maven("https://repo.papermc.io/repository/maven-public/")
+
+}
+
+// minecraft 1.20 recommended java version is 18. but we assume 17 is good enough as lts
+
+// Configure used version of kotlin and java
+java {
+    disableAutoTargetJvm()
+    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+}
+
+// Set target version
+tasks.withType<JavaCompile>().configureEach {
+    sourceCompatibility = "17"
+    targetCompatibility = "17"
+
+    options.encoding = "UTF-8"
+}
+
+kotlin {
+    compilerOptions {
+        apiVersion.set(org.jetbrains.kotlin.gradle.dsl.KotlinVersion.KOTLIN_2_0)
+        jvmTarget.set(JvmTarget.JVM_17)
+    }
+}