Add a troubleshooting section

I'm an idiot and it took me a minute to realise that my download was not broken and I should open this in the terminal. Some text like this in the README.md might help others.
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Ken Hawkins 2020-02-11 20:20:46 +01:00 committed by GitHub
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@ -46,6 +46,18 @@ docker run -d -p 8080:8080 gcr.io/tenox7/wrp:latest
* Server Gateway should run on a modern hardware/os that supports memory hungry Chrome. * Server Gateway should run on a modern hardware/os that supports memory hungry Chrome.
* Client Browser needs to support `HTML FORMs` and `ISMAP`. Typically Mosaic 2.0 would be minimum version for forms. However ISMAP was supported since 0.6B, so if you manually enter url using `?url=...`, you can use the earlier version. * Client Browser needs to support `HTML FORMs` and `ISMAP`. Typically Mosaic 2.0 would be minimum version for forms. However ISMAP was supported since 0.6B, so if you manually enter url using `?url=...`, you can use the earlier version.
## Troubleshooting
### I can't get it to open
This program does not have a GUI and is run from the command line. You may need to enable executable mode, for example on Mac:
```bash
$ cd ~/your-download-directory
$ chmod +x wrp-amd64-macos
$ ./wrp-amd64-macos -t png
```
## History ## History
* In 2014, version 1.0 started as a *cgi-bin* script, adaptation of `webkit2png.py` and `pcidade.py`, [blog post](https://virtuallyfun.com/2014/03/03/surfing-modern-web-with-ancient-browsers/). * In 2014, version 1.0 started as a *cgi-bin* script, adaptation of `webkit2png.py` and `pcidade.py`, [blog post](https://virtuallyfun.com/2014/03/03/surfing-modern-web-with-ancient-browsers/).