adding examples for app auth

[patalwell]

@gmlewis opened a seperate PR from master, have a headache from trying to revert fetches I had pulled. I'd have to cherry pick commits and would rather start fresh.

To recap, this is a simple change to README.md and an example for GitHub app authentication flow so folks can understand how to leverage installations and access tokens.

[gmlewis]

Thank you, @patalwell !
Just a few minor tweaks, please.

[patalwell]

@gmlewis good to go!

[gmlewis]

I'm not seeing any changes since my last review... did you push them?

Also, did you run go test ./... and go mod tidy ?
It looks like your new dependency was not added to go.mod... so these commands should help:

• go get github.com/bradleyfalzon/ghinstallation
• go test ./...
• go mod tidy

[codecov]

Codecov Report

Merging #2240 (600c17c) into master (4d7a0b5) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #2240 +/- ##
=======================================
Coverage 97.80% 97.80% =======================================
Files 113 113 Lines 10205 10205 =======================================
Hits 9981 9981 Misses 156 156 Partials 68 68 

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[patalwell]

@gmlewis oops, wrong branch. Pushed to the right one this time. Made the logging changes.

I didn't want to run mod tidy since we ran into issues last time with the go.mod file and go.sum files, BUT ran the commands at your discretion :)

Ran a test as well, I originally never ran one since I didn't have a test file. Also ran a linter! there was an error with one of the imports, so ran golangci-lint run --fix

[gmlewis]

Thank you, @patalwell !
LGTM.

Awaiting second LGTM from any other contributor to this repo before merging.

[patalwell]

Thank you, @patalwell ! LGTM.

Awaiting second LGTM from any other contributor to this repo before merging.

@wesleimp mind taking a look at these changes?

[patalwell]

Happy New Year! @gmlewis

Hey so dont want to lose any momentum here, anyway we can ping another commiter for review?

[gmlewis]

Happy New Year to you too, @patalwell !

Maybe @Parker77 has time to review.

[Parker77]

LGTM.

[gmlewis]

Thank you, @Parker77 !
Merging.