Improved README : Added Table of Contents, Project Overview, Contribution Guidelines, and Social Media Links

[Ayah-Saleh]

This pull request modified the SumoLogic README to make it more informative and user-friendly for new and existing contributors. This included:

• Added a Table of Contents to improve navigation.
• Added the Project Overview and Key Features sections to give the target audience/potential contributors a clearer understanding of SumoLogic's functions.
• Expanded on the Contribution Guidelines, I included a how to contribute which detailed forking, branching, and submitting pull requests.
• Added a Get Involved Section in order to encourage the audience to keep with SumoLogic and its updates on social media.

These changes were made in order to make the README more informative/clear for potential contributors.

[cla-bot]

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[kimsauce]

@Ayah-Saleh many thanks for submitting these improvements! Nice work. I'll take this back to our team to go over in our next meeting. FYI: @jpipkin1 @mafsumo @JV0812