Update README with installation options and AI agent prompts

- Add three installation methods (local path, npm link, copy dist)
- Fix Quick Start example to use correct API property names
- Add "Using AI Coding Agents" section with example prompts
- Reference AGENTS.md for detailed integration instructions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -10,6 +10,42 @@ A JavaScript/TypeScript wrapper for the [Binect API](https://app.binect.de/index
 
 ## Installation
 
+### Option 1: Local Path Reference (Recommended)
+
+Since this library is not yet published to npm, reference it via local path in your `package.json`:
+
+```json
+{
+  "dependencies": {
+    "@binect/js": "file:../binect-js"
+  }
+}
+```
+
+Then run `npm install`. Adjust the path to where you cloned/placed the binect-js folder.
+
+### Option 2: npm link
+
+```bash
+# In the binect-js directory
+cd /path/to/binect-js
+npm install
+npm run build
+npm link
+
+# In your project directory
+cd /path/to/your-project
+npm link @binect/js
+```
+
+### Option 3: Copy the dist folder
+
+1. Build the library: `cd binect-js && npm install && npm run build`
+2. Copy the `dist/` folder to your project
+3. Import directly: `import { BinectClient } from './dist/index.js'`
+
+### Future: npm (not yet available)
+
 ```bash
 npm install @binect/js
 ```
@@ -30,18 +66,20 @@ const client = new BinectClient({
 const pdfContent = readFileSync('letter.pdf').toString('base64');
 const document = await client.documents.upload({
   content: pdfContent,
+  filename: 'letter.pdf',
   color: false,
-  duplex: true,
+  simplex: false,  // false = duplex (double-sided)
   envelope: 'DINLANG',
+  franking: 'STANDARD_FRANKING',
 });
 
-console.log('Document ID:', document.documentId);
-console.log('Status:', document.status);
+console.log('Document ID:', document.id);
+console.log('Status:', document.status.code, document.status.text);
 
 // Check if ready to send
 if (isShippable(document)) {
   // Send the document as physical mail
-  const sending = await client.sendings.send(document.documentId);
+  await client.sendings.send(String(document.id));
   console.log('Mail dispatched!');
 }
 ```
@@ -201,6 +239,39 @@ See [architecture/](./architecture/) for Architecture Decision Records (ADRs):
 
 Official Binect API documentation: https://app.binect.de/index.jsp?id=api
 
+## Using AI Coding Agents
+
+This library includes an `AGENTS.md` file with comprehensive instructions for AI coding assistants (Claude, Cursor, Copilot, etc.).
+
+### Setup for AI Integration
+
+1. Ensure the binect-js folder is accessible to your project
+2. Copy `AGENTS.md` to your project root, or ensure the agent can read from binect-js
+
+### Example Prompts
+
+**To integrate the library into your project:**
+
+> I want to add physical mail sending capability using the Binect API. The @binect/js library is located at `../binect-js`. Please:
+> 1. Add it as a dependency to my package.json
+> 2. Create a mail service that can upload PDFs and send them as letters
+> 3. Include proper error handling and status checking
+>
+> Read AGENTS.md in the binect-js folder for API documentation.
+
+**To send a letter:**
+
+> Using the @binect/js library, create a function that:
+> 1. Takes a PDF file path and sends it as physical mail via Binect
+> 2. Polls until the document is ready, then triggers sending
+> 3. Returns the document ID and final status
+>
+> Credentials are in environment variables BINECT_USERNAME and BINECT_PASSWORD.
+
+**To add mail functionality to an existing service:**
+
+> Add a `sendPhysicalMail(pdfBuffer: Buffer, options?: { color?: boolean })` method to my NotificationService class. Use the @binect/js library from `../binect-js`. Handle errors appropriately and log the document status.
+
 ## License
 
 MIT