feat: npm package @crudy/pgmorbac ships the extension SQL

The package carries the install and upgrade scripts, built from src/ on prepack
(sql/ is not committed), with extensionSql(), upgradeScripts(), version and sqlDir.

README.md

@@ -77,6 +77,24 @@ sudo cp pgmorbac--1.0.0.sql $(pg_config --sharedir)/extension/
 psql -d mydb -c "CREATE EXTENSION pgmorbac;"
 ```
 
+### From Node.js (npm)
+
+`@crudy/pgmorbac` ships the same install and upgrade scripts for projects that
+apply SQL through a migration runner instead of `CREATE EXTENSION`:
+
+```bash
+npm install @crudy/pgmorbac
+```
+
+```js
+import { extensionSql, upgradeScripts, version, sqlDir } from '@crudy/pgmorbac';
+
+await client.query(extensionSql());          // pgmorbac--<version>.sql
+for (const u of upgradeScripts()) {          // pgmorbac--<from>--<to>.sql, in order
+    await client.query(u.sql);
+}
+```
+
 ## Quick Start
 
 ```sql