Add takeaway from ashtiwari007

[ashtiwari007]

My GitHub 101 Takeaway

Submitting my first PR as part of the Your Turn exercise. Adds takeaways/ashtiwari007.md.

• What I learned: the entire GitHub workflow — clone → branch → commit → push → PR — which I'd never used before.
• Main takeaway: I can step away from the fear of breaking things; there are enough built-in rollback options that a resolution is always possible.
• How I'll use it: to document my AI learning journey.

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