Update README.md

[cronky]

Added Tech Carbon Standard under the Computation category
https://github.com/ScottLogic/Technology-Carbon-Standard
A proposed Technology Carbon Standard that aims to provide a unified standard for understanding, quantifying, and reducing carbon emissions from an organisation's technology landscape.

• The project is active, documented, open source licensed, shows usage from external parties and is directly targeting environmental sustainability. Find more details in the Contribution Guide.

[andrew]

Thanks for the PR @cronky but Technology-Carbon-Standard is already in the list: https://github.com/ScottLogic/Technology-Carbon-Standard