Add harvir.py and harvir_test.py

Author: hssahota2

python/selfie-lib/selfie_lib/__init__.py

@@ -1 +1,2 @@
 from .ned import fizzbuzz as fizzbuzz
+from .harvir import silly_addition as silly_addition

python/selfie-lib/selfie_lib/harvir.py

@@ -0,0 +1,4 @@
+def silly_addition(a, b):
+    # Adds two numbers and then adds 42 to the result.
+    return a + b + 42
+

python/selfie-lib/tests/harvir_test.py

@@ -0,0 +1,6 @@
+from selfie_lib import silly_addition
+
+def test_silly_addition():
+    assert silly_addition(1, 2) == 45, "Should be 45"
+    assert silly_addition(-42, 0) == 0, "Should be 0"
+    assert silly_addition(10, 5) == 57, "Should be 57"