* modify HaaSPython's brief introduction, fix #1772
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add HaaS Python v2.2.0 release notest, fix #1726
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add README for HaaS EDU K1 examples, fix #1798
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>