Add daily git basics

[lida2003]

Basics about daily git commands:

a) clone b) pull c) status d) log e) commit d) special notes, such ‘pull’ before a certain time of update, “log” check current version, "status" code clean/dirty

etc.

[dlt2018]

1) Status: Completed 2) RootCause/Reason: No 3) Recommendation: No Comment