Add publish script and PUBLISHING.md

PUBLISHING.md

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+# Publishing
+
+Make sure you have the latest from the main branch:
+
+    git pull origin main
+
+Use `npm version` to update the version number in the `package.json`.
+
+    npm version {patch|minor|major} --no-git-tag-version
+
+Then run the publish script
+
+   ./publish.sh
+
+afterwards don't forget to update the versions to be a prerelease of the next version, so if you just published 1.1.1 then:
+
+    npm version 1.1.2-dev
+    git push --follow-tags

publish.sh

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+#!/bin/bash
+
+# get current version
+VERSION=$(node -e "console.log(require('./package.json').version)")
+
+# Build
+git checkout -b build
+npm run build
+git add dist -f
+git commit -m "build $VERSION"
+
+# Tag and push
+git tag -f v$VERSION -m "$VERSION"
+git push --tags git@github.com:proj4js/wkt-parser.git $VERSION
+
+# Publish
+npm publish
+
+# Cleanup
+git checkout main
+git branch -D build