Move pertinent documentation to 01-main subfolder

01-main/CONTRIBUTING.md

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+# Adding Software
+## What is acceptable?
+This defines what software can be added to the main repository, and therefore the scope of the project in terms of what it is intended for:
+* Software **has to be published as a `.deb`**. Build from source, tarballs or other binary releases will not be accepted.
+* Software **has to be published authoritatively by the upstream vendor, project or maintainer**. Packages published by unassociated community contributors will not be accepted.
+* Software **must be actively maintained**.
+* **Only stable/production releases**. Daily/nightly, betas or pre-release versions will not be accepted.
+* GitHub Releases and direct downloads **must have a reliable means to dynamically determine the current upstream published version**. Hardcoded versions will be not accepted.
+* **Packages that install directly from the official Debian or Ubuntu apt archives will not be accepted**.
+* **Packages that replace components in the hardware enablement stack (HWE) such as the Linux kernel and Mesa will not be accepted**.
+
+If you found a package that fits the criteria above, have checked that it does not already have a pending request and has not previously been declined, please [open an issue](../../../issues/new) following the template for requesting a new app.
+
+## Creating the package definition file
+**Before [opening a pull request](../../../pulls) to add a new package, make sure an [issue is already open](../../../issues) for it**. **This helps keep things organized**.
+
+**Before submitting a PR, do not forget to [update README.md](#updating-readmemd)**.
+
+For information on how to create a package definition file, head to [EXTREPO](../EXTREPO.md#the-package-definition-files).
+
+# Updating README.md
+**This needs to be done every time a package is added or removed, or the details of a package are changed**.
+
+To update `README.md`, first install [cog](https://pypi.org/project/cogapp):
+```bash
+sudo pip3 install cogapp
+```
+
+Then run:
+```bash
+cog -r README.md
+```