Add npm publish option

Author: cferdinandi

.github/main.workflow

@@ -0,0 +1,9 @@
+workflow "Release" {
+  on = "release"
+  resolves = ["Publish to NPM"]
+}
+
+action "Publish to NPM" {
+  uses = "actions/npm@e7aaefed7c9f2e83d493ff810f17fa5ccd7ed437"
+  runs = "npm publish"
+}