docs(readme): add customization examples

README.md

@@ -82,6 +82,45 @@ Decoding supports the above types, including the following CBOR tag numbers:
 | 35 | RegExp |
 
 
+## Customizations
+
+Borc supports custom tags as well as custom input types.
+
+### Encode Custom Types
+
+```js
+class MyType {
+ constructor (val) {
+ this.val = val
+ }
+
+ // Gets called when encoding this object
+ // gen - instance of the encoder
+ // obj - the object being encoded
+ //
+ // should return true on success and false otherwise
+ toCBOR (gen, obj) {
+ return gen.pushAny('mytype:' + this.val.toString())
+ }
+}
+```
+
+### Encode Custom Tags
+
+```js
+cbor.encode([new cbor.Tagged(42, 'hello')])
+```
+
+### Decode Custom Tags
+
+```js
+const decoder = new cbor.Decoder({
+ tags: {
+ 42: (val) => val + ' world'
+ }
+})
+```
+
 ## License
 
 MIT