Update and rename main.workflow to npm-publish.workflow

Author: jasny

.github/npm-publish.workflow

@@ -0,0 +1,10 @@
+workflow "Publish to NPM" {
+  resolves = ["GitHub Action for npm"]
+  on = "release"
+}
+
+action "GitHub Action for npm" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  args = "publish"
+  secrets = ["NPM_AUTH_TOKEN"]
+}