fix readme.md
corrected path for building lib-example app
@@ -6,7 +6,7 @@ It is specific for nrf53 using nrf-connect.
To build:
```
-$ west build -p auto -b nrf5340pdk_nrf5340_cpuapp <UBXLIB>/common/lib_example/platform/nordic/nrf53/sdk/nrfconnect
+$ west build -p auto -b nrf5340pdk_nrf5340_cpuapp <UBXLIB>/common/lib_example/example-app/platform/nordic/nrf53/sdk/nrfconnect
```
This application includes the library as a data array as generated by the library make script.
