Add ImmutableKeyword

src/main/java/com/laytonsmith/core/compiler/keywords/ImmutableKeyword.java

@@ -0,0 +1,34 @@
+package com.laytonsmith.core.compiler.keywords;
+
+import com.laytonsmith.PureUtilities.Version;
+import com.laytonsmith.core.MSVersion;
+import com.laytonsmith.core.ParseTree;
+import com.laytonsmith.core.compiler.Keyword;
+import com.laytonsmith.core.exceptions.ConfigCompileException;
+import java.util.List;
+
+/**
+ *
+ */
+/**
+ *
+ */
+@Keyword.keyword("public")
+public class ImmutableKeyword extends Keyword {
+
+	@Override
+	public int process(List<ParseTree> list, int keywordPosition) throws ConfigCompileException {
+		throw new ConfigCompileException("Keyword not supported yet.", list.get(keywordPosition).getTarget());
+	}
+
+	@Override
+	public String docs() {
+		return "Indicates that the class or variable is immutable.";
+	}
+
+	@Override
+	public Version since() {
+		return MSVersion.V0_0_0;
+	}
+
+}