Go Gin framework Authentication Demo and Fixing error in Guidelines.md file

[gagan3012]

Checklist

• [X] You have read the Contribution Guidlines before creating this PR.
• [X] This is not a duplicate entry for any framework or language\

Description of change

I have done the following things:

1) Created a Go gin framework demo which uses the go-SDK of login-radius 2) added a Readme file for the demo with all instructions 3) fixed an error in the guidelines.md file

[pareek-naren]

@gagan3012 You can follow our guideline and our go library document for more details.

[gagan3012]

I have made the asked changes please take a look!

[pareek-naren]

@gagan3012 The demo is not in working condition. as in you are not passing the status error or success along with the response/error. The profile will also be in response.data

If you check the existing node js express example

• In case of success

  output.data = response;
  output.message = 'Profile fetched';
  output.status = 'success';

• In case of error

  output.status = 'error';
  output.message = 'an error occoured';

Please let me know if you need any help in this.

[gagan3012]

@pareek-narendra I have added output instructions now please let me know if this is acceptable.

[gagan3012]

@pareek-narendra I have removed the account API please take a look!

[gagan3012]

@pareek-narendra I have added the IsPosted check please take a look.