add Fibonacci Generator Example

fibonacci.py

@@ -0,0 +1,30 @@
+# Example generator which calculates fibonacci numbers:
+# Generator version
+def fib(number):
+    a = 0
+    b = 1
+    for i in range(number):
+        yield a
+        temp = a
+        a = b
+        b = temp + b
+
+
+for x in fib(100):
+    print(x)
+
+
+# List version
+def fib2(number):
+    a = 0
+    b = 1
+    result = []
+    for i in range(number):
+        result.append(a)
+        temp = a
+        a = b
+        b = temp + b
+    return result
+
+
+print(fib2(100))