Add GitHub InnerSource principles doc contents

[zkoppert]

doing this based off of the discussion here

[spier]

Thanks for starting this @zkoppert.

Can you explain why the Engagement Model is key? That part is the only thing that is different from the purpose+principles structure of the other 2 orgs, that's why it caught my eye.

[zkoppert]

Thanks for starting this @zkoppert.

Can you explain why the Engagement Model is key? That part is the only thing that is different from the purpose+principles structure of the other 2 orgs, that's why it caught my eye.

I've attempted to do that here. Let me know if it needs more information.

[zkoppert]

Hey @spier! Any changes you would like to see here?

[spier]

My bad. Was looking at this in the GitHub mobile app some time ago and couldn't see the whole file. Then I got distracted.

I do recall that I was wondering if it would be easier to follow if we put a generic description of the approach in the Solution block and then put the 3 examples of the company-specific implementations under the Known Instances.

Will try to make time for a more detailed review in the evening. But if I don't make it today then I unfortunately won't get to it before next Friday.

[zkoppert]

Thanks @spier. Yes I added the implementation details under the known instances header. Let me know what you think, when available, on what we should add for a general description that you mentioned.

[spier]

Left some suggestions including some text for the general description. Hope you like it :)

Further I am unsure whether to write the GitHub KI block from the "we" or "they" perspective. Bosch used the latter.

Need to review some other patterns to see if we have a similar example that we can follow.

[spier]

Lgtm

Added two minor fixes that I will commit myself.

[spier]

Thank you @zkoppert for sharing the GH principles with us! This will go live in the online book momentarily.