Integrate ansible-creator and devtools into the developing collections guide

[samccann]

https://github.com/ansible/ansible-creator is a useful new tool that we should include in our docs for how to develop new collections.
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ansible-creator is part of the developer tools stuff and can scaffold a collection. Also mention https://github.com/ansible/ansible-dev-tools - which is like a curated package of developer tools projects.

This issue follows up on #88

[samccann]

@xszabo3 - here's the alternate is as @oraNod discussed in chat.

[oraNod]

Estimated effort: L (MUNI tech writers)

[xszabo3]

@oraNod Hi! Can I work on this issue?

[oraNod]

@oraNod Hi! Can I work on this issue?

All yours @xszabo3 Let us know if you have questions or need any help. Thanks for taking this one!