Added another example

README.md

@@ -25,9 +25,28 @@ And you're good to go!
 
 Easy!
 
-````python
+```python
 import improved
 
 improved.callIMP("n := 5")
 # this will return a dictionary containing the key/value pair n/5
 ```
+
+For a less contrived example, let's calculate the nth fibonacci number
+where n is user input:
+
+```python
+import improved
+
+x = """
+  n := read;
+  fib := 1;
+  while n > 1 do
+    fib := n * fib;
+    n := n -1
+  end;
+  write fib
+"""
+
+improved.callIMP(x)
+```

examples/fib.py

@@ -0,0 +1,13 @@
+import improved
+
+x = """
+  n := read;
+  fib := 1;
+  while n > 1 do
+    fib := n * fib;
+    n := n -1
+  end;
+  write fib
+"""
+
+improved.callIMP(x)