[add] Improved package description and badges (#8)

Author: filipecosta90

README.rst

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-[![codecov](https://codecov.io/gh/filipecosta90/redis-benchmarks-specification/branch/master/graph/badge.svg)](https://codecov.io/filipecosta90/redis-benchmarks-specification)
-![Actions](https://github.com/filipecosta90/redis-benchmarks-specification/workflows/Run%20Tests/badge.svg?branch=master)
-![Actions](https://badge.fury.io/py/redis-benchmarks-specification.svg)
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+[![codecov](https://codecov.io/gh/filipecosta90/redis-benchmarks-specification/branch/main/graph/badge.svg?token=GS64MV1H4W)](https://codecov.io/gh/filipecosta90/redis-benchmarks-specification)
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 ## Benchmark specifications goal
 
 The Redis benchmarks specification describes the cross-language/tools requirements and expectations to foster performance and observability standards around redis related technologies.