Add "sample" documentation to sample project.

This fixes part of PR2793.

llvm-svn: 56198
diff --git a/llvm/projects/sample/docs/index.html b/llvm/projects/sample/docs/index.html
new file mode 100644
index 0000000..d2e6786
--- /dev/null
+++ b/llvm/projects/sample/docs/index.html
@@ -0,0 +1,6 @@
+<html>
+  <body>
+    <h1>SAMPLE PROJECT DOCUMENTATION</h1>
+    <p>This is just a placeholder</p>
+  </body>
+</html>