Initial commit based on current tempest

This creates the tempest plugin for horizon and duplicates
the existing horizon scenario test in tempest.

Change-Id: I9430b6cefc884ecc105e91ec19a07987aa70ef98
diff --git a/doc/source/usage.rst b/doc/source/usage.rst
new file mode 100644
index 0000000..b24203d
--- /dev/null
+++ b/doc/source/usage.rst
@@ -0,0 +1,7 @@
+========
+Usage
+========
+
+To use tempest-horizon in a project::
+
+    import tempest-horizon