Explanation about conda package.

### Where should the content be added?

https://conda-forge.org/docs/user/introduction.html (A brief introduction)

### What should be added?

The Brief Introduction page is mostly about the what and why of the conda-forge community. A beginner might not really get it when he/she reads the word "Conda packages" for the first time. Explanation in a line or two about what a conda package is would be helpful for beginners. This is my suggestion. Can I please work on this?
@beckermr @kathatherine

### Additional information

_No response_