Add title option to Code Coverage Summary output

[syed-farazahmed]

This pull request includes several changes to add a "title" field to the code coverage summary output and to standardize the use of double quotes in the action.yml file.

Adding "title" field to code coverage summary:

• README.md: Added a "title" field to the job configuration to allow setting a custom title for the code coverage summary.
• action.yml: Introduced a new input parameter title to specify a title for the output, with a default value of "Code Coverage Summary".
• src/CodeCoverageSummary/CommandLineOptions.cs: Added a new option Title to the CommandLineOptions class to accept a title for the output.
• src/CodeCoverageSummary/Program.cs: Updated the GenerateTextOutput and GenerateMarkdownOutput methods to include the title in the output if provided. [1] [2] [3]

Standardizing quotes in action.yml:

• action.yml: Replaced single quotes with double quotes for consistency across the file.