Added fibonacci snippet

snippets/fibonacci.md

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+### fibonacci
+
+Generates a list containing the Fibonacci sequence up to the nth term.
+
+Starting with 0 and 1, adds the sum of the last two numbers of the list to the end of the list using ```list.append()``` until the length of the list reaches n.  If the given nth value is 0 or less, the method will just return a list containing 0.
+
+``` python
+def fibonacci(n):
+    if n <= 0:
+        return [0]
+
+    sequence = [0, 1]
+    while len(sequence) <= n:
+        # Add the sum of the previous two numbers to the sequence
+        next_value = sequence[len(sequence) - 1] + sequence[len(sequence) - 2]
+        sequence.append(next_value)
+
+    return sequence
+```
+
+``` python
+fibonacci(7) # [0, 1, 1, 2, 3, 5, 8, 13]
+```