Add .gitignore file

Change-Id: Iedc9c7f38679a527b612d9f31d32e19c586516cf

.gitignore

@@ -0,0 +1,26 @@
+# Add patterns in here to exclude files created by tools integrated with this
+# repository, such as test frameworks from the project's recommended workflow,
+# rendered documentation and package builds.
+#
+# Don't add patterns to exclude files created by preferred personal tools
+# (editors, IDEs, your operating system itself even). These should instead be
+# maintained outside the repository, for example in a ~/.gitignore file added
+# with:
+#
+# git config --global core.excludesfile '~/.gitignore'
+
+pkg/
+Gemfile.lock
+vendor/
+spec/fixtures/
+.vagrant/
+.bundle/
+coverage/
+.idea/
+*.iml
+/openstack
+/log
+
+# Files created by releasenotes build
+releasenotes/build
+.tox