Create README.md

Ravi Prakash Joshi · web-flow · commit 71302bcc6dd9 · 2018-01-17T20:09:54.000+09:00
diff --git a/lib/README.md b/lib/README.md
@@ -0,0 +1,9 @@
+Place extracted `protobuf-3.5.0.tar.gz` here. The directory structure should look as following:
+
+```
+lib
+└── protobuf-3.5.0
+    ├── bin
+    ├── include
+    └── lib
+```
