Software Environment:

• OpenLooKeng version (source or binary): NA

• OS platform & distribution (eg., Linux Ubuntu 16.04): NA

• Java version:

Describe the current behavior

only have user guide with some error

Describe the expected behavior

1. fixed user guide error
2. add development guid
3. update root direction's READM.md

only update repo's document, for hetu-core's odbc document update will do on other issue.

Steps to reproduce the issue

1. compare with document before or after pr

Related log/screenshots

NA

Special notes for this issue

NA