add tempalte for plugins

src/template-plugin.ts

@@ -0,0 +1,14 @@
+import { PodliteWebPlugin, PodliteWebPluginContext } from './plugins'
+import { publishRecord } from './shared'
+
+const plugin = (): PodliteWebPlugin => {
+  const outCtx: PodliteWebPluginContext = {}
+  const onExit = ctx => ({ ...ctx, ...outCtx })
+  const onProcess = (recs: publishRecord[]) => {
+    return recs
+  }
+
+  return [onProcess, onExit]
+}
+
+export default plugin