Allow building of this repo

Add subfolder style build CMakeLists.txt

Tested: cmake build successful

Change-Id: I136cba5283804dd58e54dd90a35ac3f7edd57b67
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a007fea
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/*