Add the first test and .gitignore

The first test fails to import the project.

.gitignore

@@ -0,0 +1,2 @@
+*.sw[o,p]
+**/__pycache__**

tests/test_rover.py

@@ -0,0 +1,5 @@
+from rover import Rover
+
+
+def test_can_land():
+    assert Rover()