📚 Add memory on PR creation

.serena/memories/creating-prs.md

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+# Creating Pull Requests
+
+Important: Before creating a PR, ensure that you are on a branch that is specific to the 
+issue or feature you are working on. If necessary, create a new branch.
+
+## Title Format
+
+PR titles follow the same convention as commit titles:
+
+```
+:emoji: Subject line (imperative, capitalized, no period, ≤70 chars)
+```
+
+See the `creating-commits` memory for the list of emoji codes.
+
+## Description Format
+
+The PR description must start with the following notice:
+
+> **Note:** This PR was created with AI assistance as part of the Penpot MCP self-improvement initiative.
+
+ **Related Issues** section with a bullet list of linked issues:
+
+```
+In addition to sections summarising and explaining the changes in the PR, it should contain a section 'Relevant Issues' with a bullet list:
+
+- Fixes #NNNN
+- Resolves #NNNN
+- Relates to #NNNN
+```