clap/examples/02_apps.md

Apps describe the top level application

You can see this in the help:
```bash
$ 02_apps --help
MyApp 1.0

Kevin K. <kbknapp@gmail.com>

Does awesome things

USAGE:
    02_apps[EXE]

OPTIONS:
    -h, --help       Print help information
    -V, --version    Print version information
```

And among the version
```bash
$ 02_apps --version
MyApp 1.0
```
test: More thoroughly test examples This ports our example testing over to [trycmd](https://docs.rs/) so we can: - More thoroughly test our examples - Provide always-up-to-date example usage The old way of testing automatically picked up examples. This new way requires we have a `.md` file that uses the example in some way. Notes: - Moved overall example description to the `.md` file - I added cross-linking between related examples - `14_groups` had a redundant paragraph (twice talked about "one and only one" 2021-11-10 22:15:30 +00:00			`Apps describe the top level application`

			`You can see this in the help:`
			```bash
			`$ 02_apps --help`
			`MyApp 1.0`

			`Kevin K. <kbknapp@gmail.com>`

			`Does awesome things`

			`USAGE:`
			`02_apps[EXE]`

			`OPTIONS:`
			`-h, --help Print help information`
			`-V, --version Print version information`
			```

			`And among the version`
			```bash
			`$ 02_apps --version`
			`MyApp 1.0`
			```