Update README.md

README.md

@@ -1,16 +1,51 @@
 bson2v8
 =======
 
-deps: [mongodb-c-driver](https://github.com/mongodb/mongo-c-driver)
+deps: 
+* [mongodb-c-driver](https://github.com/mongodb/mongo-c-driver)
+* [v8](https://github.com/v8/v8)
+
+purposes:
+
+* Convert a `v8::Handle<v8::Value>` variable to a `bson*` type.
+* Convert a `bson*` or `char*` means the buffer data of a `bson*` variable to a `v8::Local<v8::Value>`.
 
-Convert from a bson to the v8 object, This project will help u to use mongodb better.
 
 ## API:
 
 `ParseBSON(const char* buffer)` provide u can pass a bson raw data.
 
 `ParseBSON(const bson* buffer)` provide u can pass a bson object.
 
+`ToBSON(Local<Value> in, bson* out)` provide u can pass 1 in v8::Value and out a bson* pointer.
+
+### Usage:
+
+#### create a bson from `v8::Local<v8::Value>`
+```c
+Handle<Value> create_bson(const Arguments& args) {
+  // create a bson
+  bson* b = bson_alloc();
+  Utilities::ToBSON(args[0], result);
+
+  // now u can print the bson result
+  bson_print(b);
+  // the end, remember destroy this bson heap
+  bson_destroy(b);
+}
+```
+
+#### get a `v8::Local<v8::Object>` from a bson in [mongo-c-driver](https://github.com/mongodb/mongo-c-driver)
+```c
+Local<Object> return_v8_value(const char* buffer) {
+  // so easy, right?
+  return Utilities::ParseBSON(buffer);
+}
+```
+
+
+
+
 ## LICENSE
 
-MIT
+MIT, I'm so gald for this could help u :)