chore: Add HOW_TO_MAKE_RELEASE.md instructions

Author: KararTY

HOW_TO_MAKE_RELEASE.md

@@ -0,0 +1,16 @@
+Are you considering to prepare a PR to create a new release?
+
+**Create a new PR, while inside the PR branch:**
+* Open package.json, change version number accordingly. (E.g. 1.0.1)
+* Run `npm run generate-changelog`.
+* Open package.json again, reset number back to previous version. (E.g. 1.0.0)
+* Commit and push the two generated files, `CHANGELOG.md` & `src/routes/changelogs/changelogs.html`.
+
+Squash branch into main with commit message `chore: Changelogs for v1.0.1`.
+
+**Switch to main branch:**
+* Run `npm version <stuff>`, currently it's `npm version prerelease --preid beta` but eventually stick to patch, minor and major.
+* Push generated commit.
+* Run `git push origin tag v1.0.1` to publish tag.
+
+Done. 🎉