[new] create categories, and move blog file to correct place
[modify]renamed: post/ServerDesign/read_write_object_api.md -> post/ServerDesign/db_layer_api.md
[new] write about me file.
new file:   post/AboutMe/about_me.md
[modify] change "doc" filed in gipress.json, and give a readme for this repo.
	modified:   README.md
	modified:   gitpress.json