use the sample debuggee program in the readme as an example (#17)

Author: csabahruska

README.md

@@ -56,7 +56,8 @@ The `dap-estgi-server` and `dap-estgi-vscode-extension` are application specific
            9.2.7:
              url: "https://github.com/grin-compiler/foundation-pak/releases/download/ghc-9.2.7/ghc-9.2.7-aarch64-apple-darwin.tar.xz"
      ```
-   * Run: `stack build`
+   * Run: `stack build`  
+     i.e. build the provided sample hello world: `(cd sample-program-to-debug ; stack build)`
 5. Open debuggee program in VSCode [Extension Development Host]  
    * Open debugge project folder by using the `Files/Open Folder` menu.
    * Select the debug view on the side bar