Add class support with constructors, fields, and methods

projects/custom_fn.j

@@ -1,4 +1,8 @@
-fn greet(name):
-    println("Hola, " + name)
+x = "Hello world!"
 
-greet("mundo!")
+fn suma(x, y):
+    fn pow(z):
+        return z * z
+    return x + pow(y)
+
+println(suma(2, 2))