[oe] [meta-openwrt] Issues adding layer using readme instructions

[Diana Thayer]

Hello!

I'm experiencing issues building with meta-openwrt. Following the
instructions in the readme <https://github.com/kraj/meta-openwrt>, I get
this error:

```
$ bitbake-layers add-layer ../meta-openwrt
NOTE: Starting bitbake server...
Loading cache: 100% |#############################
#####################################################################################|
Time: 0:00:00
Loaded 66 entries from dependency cache.
ERROR: Parse failure with the specified layer added
                                                          | ETA:  --:--:--
```

What failed? Why? How do I debug it? I followed the directions step by
step, both within openembedded-core and poky.

Thanks for any help you can provide.

Best regards,
Diana