Support of missing functions, refactoring of tests and correction of typos

[foufure]

Please review the changes and commit them to the main branch. A commit was done for each file or group of files:

• Wrapper was extended with the API functions that were not available until now.
• Some existing functions and their respective tests were improved or corrected
• README.md and LICENSE.TXT were added
• Some typos were corrected in the code and in the code documentation
• An example project was added

[dmitry-textmagic]

Hi Jonathan, I see you have added "Newtonsoft JSON.NET" as a dependency for TextMagicRest project. But since v103 RestSharp is not depending on JSON.NET anymore: https://groups.google.com/forum/#!msg/restsharp/yjGCtOnEYHk/XbKZi0yjN8cJ

So maybe we should remove it also? Or what do you think?

[foufure]

Yes you are right I will make the correction right now, commit and make a new pull request.