chore: add README

Author: inca

README.md

@@ -0,0 +1,52 @@
+# Module Loader
+
+This module loader allows loading ESM modules from HTTP and data: URLs.
+
+A brief chart of what is allowed to import what:
+
+```mermaid
+flowchart LR
+    http(Http URL)
+    data(Data URL)
+    file(File URL)
+    relative(Relative URL)
+    node_modules(node_modules)
+    builtins(Node.js builtins)
+
+    http --> http
+    http --> data
+    http --> relative
+
+    data --> http
+    data --> data
+
+    file --> file
+    file --> http
+    file --> data
+    file --> node_modules
+    file --> builtins
+    file --> relative
+```
+
+- `file:` modules can import:
+    - other `file:` modules
+    - `http:` modules
+    - `data:` modules
+    - `node_modules` modules
+    - Node.js builtins
+    - relative URLs (e.g. `./foo.js`)
+
+- `http:` modules can import:
+    - other `http:` modules
+    - `data:` modules
+    - relative URLs (e.g. `./foo.js`)
+
+- `data:` modules can import:
+    - other `data:` modules
+    - `http:` modules
+
+## Usage
+
+```
+node --import @nodescript/module-loader/register ./entrypoint.js
+```

package.json

@@ -5,7 +5,7 @@
     "description": "HTTP module loader for NodeScript backend runtime",
     "exports": {
         ".": "./out/main/index.js",
-        "./register-async": "./register-async.mjs"
+        "./register": "./register-async.mjs"
     },
     "files": [
         "out/main/**/*"