Add the first skill write-changelog item (#1528)

Author: gitbuda

skills/write-changelog-item/README.md

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+# Write Changelog Item
+
+Using the @infra/skills/write_changelog_item/SKILL.md write the item and put it
+under the @documentation/pages/release-notes.mdx under the right block (make
+sure the items in the block are orderd by the PR number, existing PRs are
+already ordered):
+
+@PR 3730: memgraph/memgraph
+
+... after this just keep pasting only the PR links below ...

skills/write-changelog-item/SKILL.md

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+---
+name: write_changelog_item
+description: Create/write the changelog item / release note for a given Github PR
+---
+
+For a given Github PR write a changelog item.
+
+The changelog item should be benefit focused (highlight the why). The changelog
+item should be in the markdown format, don't remove ticks and markdown links,
+don't use bold and italic, use - at the beginning of the item.
+
+Usually the PR has the item written in our of the commends under the PR. Try to
+extract that first and improve according to the above description.
+
+If that changelog item is not already there, feel free to create one, again
+according the the above guidelines.
+
+If the PR introduces the breaking change, wrote 2 items one for the "regular"
+sections (Features, Improvements, Bug Fixes, Bug) and one for the Breaking
+section. The item under the Breaking section should be in the format: "What
+happend? What the end-user should do about it?".