DOC: tweaks about contributors

Author: lucascolley

CONTRIBUTORS.md

@@ -1,5 +1,8 @@
 ## Contributors
 
+This project exists thanks to the following contributors
+([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore-start -->
 <!-- markdownlint-disable -->
@@ -29,3 +32,7 @@
 <!-- prettier-ignore-end -->
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the
+[all-contributors](https://github.com/all-contributors/all-contributors)
+specification. Contributions of any kind welcome!

README.md

@@ -38,6 +38,9 @@ Used by:
 
 ## Contributors
 
+This project exists thanks to the following contributors
+([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore-start -->
 <!-- markdownlint-disable -->
@@ -67,3 +70,7 @@ Used by:
 <!-- prettier-ignore-end -->
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the
+[all-contributors](https://github.com/all-contributors/all-contributors)
+specification. Contributions of any kind welcome!

docs/contributing.md

@@ -2,10 +2,14 @@
 
 Contributions are welcome from any "array-consuming" library contributors who
 have found themselves writing private array-agnostic functions in the process of
-converting code to consume the standard!
+converting code to consume the standard.
+
+Thanks to [all contributors](contributors.md) so far!
 
 ## How to contribute a function
 
+- [Open an issue](https://github.com/data-apis/array-api-extra/issues/new) to
+  propose the new function.
 - Add the implementation of your function to `src/array_api_extra/_funcs.py`.
   - Ensure that your function includes type annotations and a
     [numpydoc-style docstring](https://numpydoc.readthedocs.io/en/latest/format.html).

docs/index.md

@@ -19,6 +19,12 @@ tools which provide _extra_ functionality on top of the array API standard,
 which other array-consuming libraries in a similar position have found useful
 themselves.
 
+It is currently used by:
+
+- [SciPy](https://github.com/scipy/scipy) - Fundamental algorithms for
+  scientific computing.
+- ...
+
 (installation)=
 
 ## Installation