Feature: Add screencast link to README to giving overview for contrib…

…utors (#4090)

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## Because
<!-- Summarize the purpose or reasons for this PR, e.g. what problem it
solves or what benefit it provides. -->

This PR adds an interactive screencast to the README that gives a
general overview of the contributing guide to new collaborators. It
helps people who may be new to contributing to this or any other repo
get a sense of the code base and how to get it running locally. I used a
new Scrimba feature that lets one make a video screencast with all the
assets of a github repo.

## This PR
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changes. -->

- Added link to interactive screencast (scrim) to __README__ in the
__Contributing__ section

## Issue
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with the issue number, e.g. Closes #2013.

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Related to #3470

## Additional Information
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discussion. -->

Here is a link to the screencast (scrim):
https://scrimba.com/scrim/cEggQncE
I can also turn this into an image that links to the scrim video instead
of text if you prefer that.

## Pull Request Requirements
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e.g. [x]. After you create the PR, they will become checkboxes that you
can click on. -->
- [x] I have thoroughly read and understand [The Odin Project
Contributing
Guide](https://github.com/TheOdinProject/theodinproject/blob/main/CONTRIBUTING.md)
- [x] The title of this PR follows the `keyword: brief description of
change` format, using one of the following keywords:
  - `Feature` - adds new or amends existing user-facing behavior
- `Chore` - changes that have no user-facing value, refactors,
dependency bumps, etc
  - `Fix` - bug fixes
-   [x] The `Because` section summarizes the reason for this PR
- [x] The `This PR` section has a bullet point list describing the
changes in this PR
- [ ] I have verified all tests and linters pass after making these
changes.
- [x] If this PR addresses an open issue, it is linked in the `Issue`
section
-   [ ] If applicable, this PR includes new or updated automated tests

README.md

@@ -23,6 +23,8 @@ Our community can be found on the [TOP Discord server](https://discord.gg/fbFCkY
 
 The Odin Project depends on open-source contributions to improve, grow, and thrive. We welcome contributors of all experience levels and backgrounds to help maintain this awesome curriculum and community. If you would like to contribute to our curriculum, be sure to thoroughly read our [contributing guide](https://github.com/TheOdinProject/theodinproject/blob/main/CONTRIBUTING.md).
 
+__Feel free to also watch [this interactive screencast](https://scrimba.com/scrim/cEggQncE), which will give you an introduction to the repository.__
+
 ## Significant Contributors
 
 -   [Erik Trautman](https://github.com/eriktrautman)