Add the devspecs doc to tricircle doc. Make it more openly for
people who are interest in tricircle.
Change-Id: Ia26c82f4c348664e0bdee4c36c9e13f8f3a8b7fc
Signed-off-by: song baisen <songbaisen@szzt.com.cn>
Co-Authored-By: tangzhuo <ztang@hnu.edu.cn>, zhiyuan_cai <luckyvega.g@gmail.com>