Update feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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 Welcome to COSMO! You can use this Github issue to suggest a new feature for COSMO.
 
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+### Is your feature request related to a problem?
+
+A clear and concise description of what the problem is. Example: I'm always frustrated when [...]
+
+### Describe the solution you'd like
 
-**Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+### Optional: Describe alternatives you've considered
+
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
-Add any other context or screenshots about the feature request here.
+### Additional context
+
+Add any other context, screenshots, code snippets about the feature request here.
 
 If you want to contribute a feature yourself, you can follow our guide [How-to-develop](https://oxfordcontrol.github.io/COSMO.jl/dev/contributing/#How-to-develop).