feat: explaining help-wanted issue tag

CONTRIBUTING.md

@@ -79,6 +79,7 @@ All contributors will be acknowledged.
 - `contribute-addition`: a pull request that contains new material
 - `contribute-change`: a pull request that changes or fixes existing material
 - `governance`: discussion of direction, use, etc.
+- `help-wanted`: requires knowledge or skills the core maintainer lacks
 - `in-content`: issue or PR is related to lesson content
 - `in-infrastructure`: issue or PR is related to build tools, styling, etc.
 - `report-bug`: issue reporting an error

README.md

@@ -6,8 +6,9 @@
 
 - Contributions are very welcome:
  please see the [contributors' guide][contribute] for background
- and our [license][license] for terms of use.
- Please note that all contributors are required to abide by our [Code of Conduct][conduct].
+ and [these issues][help-wanted] for items where assistance would be most appreciated.
+ Please also see our [license][license] for terms of use,
+ and note that all contributors are required to abide by our [Code of Conduct][conduct].
 
 <div align="center">
  <p>
@@ -23,6 +24,7 @@
 
 [conduct]: https://gvwilson.github.io/sql-tutorial/conduct/
 [contribute]: https://gvwilson.github.io/sql-tutorial/contributing/
+[help-wanted]: https://github.com/gvwilson/sql-tutorial/issues?q=is%3Aissue+is%3Aopen+label%3Ahelp-wanted
 [license]: https://gvwilson.github.io/sql-tutorial/license/
 [release]: https://github.com/gvwilson/sql-tutorial/raw/main/sql-tutorial.zip
 [site]: https://gvwilson.github.io/sql-tutorial/