Readme (#112)

* update readme

* update readme

* fix some english issues

* Update README.md

* Update README.md

* finalize README.md

* Update README.md

* Update README.md

* Badges

* Update README.md

* Update README.md

* include locust and api documentation

* update jmeter image

* add codecov badge

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Co-authored-by: Ziad Othman <[email protected]>
Co-authored-by: Ibrahim Abou Elenein <[email protected]>
Co-authored-by: Ahmed Nasser <[email protected]>