* docs: fix simple typo, clearning -> learning

There is a small typo in CONTRIBUTING.md.

Should read `learning` rather than `clearning`.

* Update CONTRIBUTING.md

Without black being installed, I get the error: black is not installed

* [CONTRIBUTING] Add non specified dependencies

Missing infos when I tried to contribute

* Revert "[CONTRIBUTING] Add non specified dependencies"

This reverts commit 75c9cf8e2b.

* [DOC] remove extra spaces

* [DOC]Add link between contribute and development docs

Try to lead newcomer into the "prefered" way

* [DOC] fix typos

* improve the reading

by taking @mingrammer's hints

* Fix simple typo: `clearning` -> `learning`

* Update CONTRIBUTING.md

* Add programming languages and frameworks.

* Remove accidentally committed .swp file.

* Added periods to the end of sentences.

This PR adds information on how to resize your images when
contributing.

It also applies a few formatting changes such as:

- Using named links to reduce clutter
- Folding the text at 80 characters for command line users
- Removing dollar signs in codeblocks if no command output is provided
  [MD014][md014]

[md014]: https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md#md014---dollar-signs-used-before-commands-without-showing-output

Fix typo