Initial soong

This creates the infrastructure that will be used to bootstrap the
soong primary builder through blueprint and ninja.

Change-Id: Iebed8f369e4db41b207d0b2a48a7a54a4dd7d45d
diff --git a/root.bp b/root.bp
new file mode 100644
index 0000000..2acb742
--- /dev/null
+++ b/root.bp
@@ -0,0 +1,4 @@
+subdirs = [
+    "build/blueprint",
+    "build/soong",
+]