Add binary search.

.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+.idea/
+*.iml
+.vscode
+__pycache__
+*pyc
+*.ipynb_checkpoints

README.md

@@ -1 +1,8 @@
-# PythonFundamentals.Exercises.Algos
+# PythonFundamentals.Exercises.Algos
+
+## Binary Search
+
+1. Open module search.py.
+2. Fill in the function "binary_search".
+3. Make sure to include unit tests in test_search.py.
+

search.py

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+from typing import List, Optional
+import logging
+
+
+def binary_search(list_in: List[int], item: int) -> Optional[int]:
+    """
+    If item exists in list_in, this function returns its position in the list.
+    """
+    pass

test_search.py

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+import unittest
+import search
+import logging
+
+logging.basicConfig(level=logging.INFO)
+
+
+class SearchTest(unittest.TestCase):
+
+    def test_binary_search(self):
+        pass
+