Update CONTRIBUTING.md

Author: lakhansamani

.github/CONTRIBUTING.md

@@ -49,7 +49,7 @@ Please ask as many questions as you need, either directly in the issue or on [Di
 6. Build Dashboard `make build-dashboard`
 7. Build App `make build-app`
 8. Build Server `make clean && make`
-   > Note: if you don't have [`make`](https://www.ibm.com/docs/en/aix/7.2?topic=concepts-make-command), you can `cd` into `server` dir and build using the `go build` command
+   > Note: if you don't have [`make`](https://www.ibm.com/docs/en/aix/7.2?topic=concepts-make-command), you can `cd` into `server` dir and build using the `go build` command. In that case you will have to build `dashboard` & `app` manually using `npm run build` on both dirs.
 9. Run binary `./build/server`
 
 ### Testing