Added function call and function definition

src/main/java/de/hsrm/compiler/Klang/nodes/expressions/FunctionCall.java

@@ -0,0 +1,19 @@
+package de.hsrm.compiler.Klang.nodes.expressions;
+
+import de.hsrm.compiler.Klang.visitors.Visitor;
+
+public class FunctionCall extends Expression {
+
+  public String name;
+  public Expression[] arguments;
+
+  public FunctionCall(String name, Expression[] arguments) {
+    this.name = name;
+    this.arguments = arguments;
+  }
+
+  @Override
+  public <R> R welcome(Visitor<R> v) {
+    return v.visit(this);
+  }
+}