Add a documentation navbar

Change-Id: I651220f2775f45144f60438278b05755e053951e
diff --git a/navbar.md b/navbar.md
new file mode 100644
index 0000000..dde7a44
--- /dev/null
+++ b/navbar.md
@@ -0,0 +1,3 @@
+* [Home](/README.md)
+* [Markdown](/Documentation/markdown.md)
+* [Developers](/Documentation/developer-guide.md)