Update README.md

result.accessToken
Merge pull request #45 from MSOpenTech/dev

Renaming files/clases to AD*; fixing some bugs
Update README.md
Add Common problems to the "read me" file
TDD: tests failing for the new users
Adding the code to fix the DCR: generate error when different user is authenticated.
Add the error to the checked in error codes header, not the copied public header.
Fix a bug where the unique name for MSA accounts is not user friendly (has prefix in front of the e-mail).
Merge branch 'dev' into DifferentUserError
Adding tests
Attempt to add more tests
Fix broken userID test, add test for when the refresh token usage gets a wrong id_token.
Merge pull request #47 from MSOpenTech/DifferentUserError

Different user error