Abhidnya

Submitted a request using the onboarding form, Thanks @mmacy for your help.

Hi @onitake, MSAL Go API is usually standard across MSALs. So on first look, this seems a little difficult to add. I'll be able to take a closer look at...

- Code TODOs - [x] Clean-up authority validation [here](https://github.com/AzureAD/microsoft-authentication-library-for-go/blob/1a6b20feab85f7e1afc14529ee38962c97b6ee1f/apps/internal/oauth/ops/authority/authority.go) - [ ] Review todo of storage.go not expiring tokens [here](https://github.com/AzureAD/microsoft-authentication-library-for-go/blob/0b43475868c96ac8fbe5a978fb54840de6bb85c6/apps/internal/base/internal/storage/storage.go#L43) and investigate [this](https://github.com/AzureAD/microsoft-authentication-library-for-go/blob/0b43475868c96ac8fbe5a978fb54840de6bb85c6/apps/internal/base/internal/storage/storage.go#L244). Also foci investigation [here](https://github.com/AzureAD/microsoft-authentication-library-for-go/blob/0b43475868c96ac8fbe5a978fb54840de6bb85c6/apps/internal/base/internal/storage/storage.go#L299) - [ ]...

Expiring tokens and authority caching TODO resolved in #215. Keeping this open for Foci investigation.

Make the samples self contained. Refer: https://github.com/AzureAD/microsoft-authentication-library-for-go/pull/228#issuecomment-865307266