Update contribution guidelines

Contributing.md

@@ -4,7 +4,9 @@ DiscordChatExporter accepts contributions in the form of issues and pull request
 
 ## Creating issues
 
-If you have a feature suggestion or want to report a bug, you are welcome to create an issue. When doing so, please follow these guidelines:
+If you have a feature suggestion or want to report a bug, you are welcome to create an issue.
+
+Guidelines:
 
 - Avoid creating an issue if a similar one already exists. Look through existing open and closed issues first.
 - Keep your issue focused on one specific problem. If you have multiple suggestions or bug reports, please create separate issues for them.
@@ -14,12 +16,15 @@ If you have a feature suggestion or want to report a bug, you are welcome to cre
 
 ## Creating pull requests
 
-If you want to contribute code to the project, you can create a pull request. When doing so, please follow these guidelines:
+If you want to contribute code to the project, you can do so by creating a pull request.
+
+Guidelines:
 
-- Make sure that there is an existing issue that describes the problem solved by your pull request. This can be ignored for trivial changes.
-- Try to keep the pull request focused and as small as possible. If you want to contribute multiple unrelated changes, please create separate pull requests for them.
-- Follow the coding style and conventions already established by the project. When in doubt which style should be used in a particular case, ask in comments to your pull request.
-- If you want to start a discussion regarding a specific part of the change, add review comments to your own code. This can be used to highlight something important or to seek input from others.
+- Make sure that there is an existing issue that describes the problem solved by your pull request. If there isn't one, please create it first.
+- Add a comment to the issue indicating that you want to submit a pull request for it. This can be a good opportunity to discuss possible solutions, finalize requirements, or ask questions.
+- Keep your pull request focused and as small as possible. If you want to contribute multiple unrelated changes, please create separate pull requests for them.
+- Follow the coding style and conventions already established by the project. When in doubt which style to use, ask in comments to your pull request.
+- If you want to start a discussion regarding a specific change you made, add a review comment to your own code. This can be used to highlight something important or to seek input from others.
 
 ## Building the project locally