Created glossary.md and defined project brand related terms

[Roseline-Bassey]

This PR includes the following:

• A new glossary.md page
• It described some Notary Project terminologies such as Notary, Notation, Notary Project Specifications, and TUF.

This PR fixes #323

The difference between these terminologies would be documented in FAQ through another PR.

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[Roseline-Bassey]

Thanks, @yizha1 I have updated this PR to address your feedback

[iamsamirzon]

LGTM

[yizha1]

LGTM

@iamsamirzon Thanks for approving this PR, but it seems you need to remove "changed request", otherwise this PR cannot be merged.

[iamsamirzon]

LGTM