Update base INSTALL to markdown and remove outdated content
diff --git a/examples/cpp/helloworld/README.md b/examples/cpp/helloworld/README.md
index 90f3d6b..8e11f7c 100644
--- a/examples/cpp/helloworld/README.md
+++ b/examples/cpp/helloworld/README.md
@@ -2,7 +2,7 @@
### Install gRPC
Make sure you have installed gRPC on your system. Follow the instructions here:
-[https://github.com/grpc/grpc/blob/master/INSTALL](../../../INSTALL).
+[https://github.com/grpc/grpc/blob/master/INSTALL](../../../INSTALL.md).
### Get the tutorial source code