update README

README.md

@@ -22,28 +22,119 @@ npm install dsn-converter
 
 ## Usage
 
-### Converting DSN to Circuit JSON
+### Basic Usage
+
+#### Converting DSN to Circuit JSON
 
 ```typescript
 import { parseDsnToCircuitJson } from "dsn-converter"
 
+// Read DSN file
 const dsnContent = await Bun.file("your-design.dsn").text()
 
+// Convert to Circuit JSON
 const circuitJson = parseDsnToCircuitJson(dsnContent)
 
+// Save the output
 await Bun.write("output.circuit.json", JSON.stringify(circuitJson, null, 2))
 ```
 
-### Converting Circuit JSON to DSN
+#### Converting Circuit JSON to DSN
 
 ```typescript
 import { circuitJsonToDsnString } from "dsn-converter"
 
+// Convert Circuit JSON to DSN format
 const dsnString = circuitJsonToDsnString(circuitJson)
 
+// Save the DSN file
 await Bun.write("output.dsn", dsnString)
 ```
 
+### Advanced Usage
+
+#### Working with DSN JSON Directly
+
+```typescript
+import { 
+  parseDsnToDsnJson,
+  convertDsnJsonToCircuitJson,
+  stringifyDsnJson
+} from "dsn-converter"
+
+// Parse DSN to intermediate JSON format
+const dsnJson = parseDsnToDsnJson(dsnString)
+
+// Modify the DSN JSON structure
+dsnJson.placement.components.push({
+  name: "NewComponent",
+  place: {
+    refdes: "U1",
+    x: 1000,
+    y: 1000,
+    side: "front",
+    rotation: 0
+  }
+})
+
+// Convert to Circuit JSON
+const circuitJson = convertDsnJsonToCircuitJson(dsnJson)
+
+// Or convert back to DSN string
+const modifiedDsnString = stringifyDsnJson(dsnJson)
+```
+
+#### Custom Component Processing
+
+```typescript
+import { convertCircuitJsonToDsnJson } from "dsn-converter"
+
+// Create Circuit JSON elements
+const elements = [
+  {
+    type: "pcb_smtpad",
+    pcb_smtpad_id: "pad1",
+    pcb_component_id: "R1",
+    shape: "rect",
+    x: 0,
+    y: 0,
+    width: 0.5,
+    height: 0.6,
+    layer: "top"
+  },
+  // Add more elements...
+]
+
+// Convert to DSN format
+const dsnJson = convertCircuitJsonToDsnJson(elements)
+```
+
+### Type Support
+
+The library provides comprehensive TypeScript types:
+
+```typescript
+import type { 
+  DsnPcb,
+  Component,
+  Padstack,
+  Network,
+  Wire
+} from "dsn-converter"
+
+// Use types for type-safe DSN manipulation
+const component: Component = {
+  name: "R1",
+  place: {
+    refdes: "R1",
+    x: 1000,
+    y: 1000,
+    side: "front",
+    rotation: 0
+  }
+}
+```
+
 ## Features
 
 - **Complete DSN Support**: Handles all major DSN file components including: