add instructions for the board

Change-Id: Ia642ea7e9b12111e818724b328fd1a6ee6bfa9cd
1) use a new tab instead of ifram for stackoverflow integration because stackoverflow restricts ifram embedding
2) refine the regexp for error message processing

Change-Id: Ie372a2d41c5e9150c147dd9739bfc15b67d58c94
Merge branch 'master' of https://github.com/ysminnpu/IDEAir