docs(readme): sap nw rfc sdk installation troubleshooting

Author: bsrdjan

doc/installation.md

@@ -157,6 +157,11 @@ Another test, using `rfcexec` command, will fail if either 32 bit NWRFC SDK is i
 cannot open shared object file: No such file or directory
 ```
 
+If all looks good and node-rfc still fails to load
+
+- Try with installation in another folder, or
+- Capture Process Monitor output for the command `node -p "require('node-rfc')"`, to find out which DLL is not loaded. More info are in [issues/284#comment](https://github.com/SAP/node-rfc/issues/284#issuecomment-1490272036)and [issues/115#comment](https://github.com/SAP/node-rfc/issues/115#issuecomment-570248671)
+
 ## Verify node-rfc installation
 
 ```shell