Added a bit more description to the way to contribute to this project.

.github/CONTRIBUTING.md

@@ -1,7 +1,27 @@
 # Contributing to SDWebImage
 
+First of all, we want to thank you for you interest in this project.
+Every contribution matters, this is how we are keeping the project alive. 
+We are all owners, from Olivier who started the project, to the people who use it in their projects and participated in a conversation, improved the documentation, created an example or made any code changes.
+If you want to help, but don't know where to begin, we recommend you start small:
+- it would help a lot if you read: https://opensource.guide/how-to-contribute/
+- read the ongoing discussions to see what the overall status is
+- pitch in the converstations where you feel it's useful. Talk to other people, ask questions if you don't understand something
+- contributing to the documentation or the ongoing converstations is as important as contributing to the code
+
 We want to make contributing to this project as easy and transparent as possible. Here are a few guidelines for making all our lives easier.
 
+## Contribute to ongoing conversations
+
+If you have a valid opinion about something we are talking about, feel free to share it.
+If you also encountered an issue that someone else described, pitch in. Better yet, if you already fixed it in a certain way, share that.
+We focus mostly on the GitHub conversations, but you can also help by going to the [questions tagged with "SDWebImage" on StackOverflow](https://stackoverflow.com/questions/tagged/sdwebimage) and getting involved.
+
+## Improving documentation
+
+A project's documentation is something you can always improve on. Make sure you go through the existing documentation and suggest changes or just create new pieces of documentation.
+Examples are also welcome.
+
 ## Asking questions
 
 We don't use GitHub as a support forum. For any usage questions that are not specific to the project itself, please ask on [Stack Overflow](https://stackoverflow.com/) instead. By doing so, you'll be more likely to quickly solve your problem, and you'll allow anyone else with the same question to find the answer. This also allows maintainers to focus on improving the project for others.