Add .gitignore file

A gitignore file specifies intentionally untracked files that
Git should ignore.
Added temporary files like *.pyc, *.swp and others.

Closes-Bug: #1727618

Change-Id: Iefa297c6992fdc930b69aefb99dadd4dddf974a7
(cherry picked from commit d866a9c)

.gitignore

@@ -0,0 +1,21 @@
+# Compiled files
+*.py[co]
+*.a
+*.o
+*.so
+
+# Packages/installer info
+*.egg
+*.egg-info
+dist
+build
+eggs
+.eggs
+parts
+var
+sdist
+develop-eggs
+.installed.cfg
+
+# Other
+.*.swp