README needs refined

[ewingjm]

Is your feature request related to a problem? Please describe.

I've noticed a couple of issues with the README that make it appear a little clumsy -

• Installation section is talking about using the sample projects rather than installing the package - the section's content is also formatted more like Wiki than README content
• The description header is superfluous
• The table of contents has only one sub-section under Usage (Obfuscation)
• Obfuscation is actually a header on the same level as Usage, rather than a sub-header as the ToC suggests
• Usage instructs people to a create a new console app - this is overly prescriptive and not necessary
• Obfuscation has its own sub-headers that aren't on the ToC
• Contributing section should point to the CONTRIBUTING.md file
• Credits section should probably be removed if we're just crediting ourselves

Describe the solution you'd like

• Correct the installation section to be about installing the package (probably move the detail about the samples to the Wiki as it bloats the README)
• Remove the description header and put the descriptive text under the title
• Move obfuscation under usage and shift a considerable amount of this to the Wiki to avoid bloating the README with only specific features
• Ensure the ToC is reflective of the actual headings
• Replace the text in the Credits section with something along the lines of "Please refer to the Contributing guide." (with a link)
• Remove the credits section

[tdashworth]

• add link(s) to XrmToolbox repo/tool.