[GSoC] Week 9 status update

Hi Git community,

Here is Shaoxuan Yuan.

I'm writing to share my latest progress [1] from GSoC week 9.

You can read it when you are free, and generously give me some advice if possible!

[1] https://ffyuanda.github.io/blog/GSoC-week-9/

--- Summary

In week 9, I did two things:

1. Send out a v3 for `git mv` (from-in-to-out).
2. Explore `git grep` and try to integrate with sparse index.

Good news this week:

1. `rm` is in the `next` branch, hooray!

I found that a verbatim development log is both hard to write and read, so I decided that I should only catch the interesting moments which may be educational or amusing :)