Update feature-request.md

- add 'your contribution' section
- add code formatting link to 'additional context'

.github/ISSUE_TEMPLATE/feature-request.md

 ---
 name: "\U0001F680 Feature Request"
-about: Submit a proposal/request for a new PyTorch Transformers feature
+about: Submit a proposal/request for a new transformers feature
 title: ''
 labels: ''
 assignees: ''
@@ -15,6 +15,10 @@ assignees: ''
 
 <!-- Please outline the motivation for the proposal. Is your feature request related to a problem? e.g., I'm always frustrated when [...]. If this is related to another GitHub issue, please link here too. -->
 
+## Your contribution
+
+<!-- Is there any way that you could help, e.g. by submitting a PR? Make sure to read the CONTRIBUTING.MD readme: https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md -->
+
 ## Additional context
 
-<!-- Add any other context or screenshots about the feature request here. -->
+<!-- Add any other context or screenshots about the feature request here. If you have code to share, use code tags rather than screenshots: https://help.github.com/en/github/writing-on-github/creating-and-highlighting-code-blocks#syntax-highlighting -->