add usage to readme

README.md

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+# RpcCore
+Multiplatform JSON RPC Library using Kotlin Serialization
+
+## Usage
+
+### Network Driver
+RpcCore does not provide a multiplatform networking implementaion, you must provide your own by implementing the `HttpNetworkingDriver` interface: 
+```kotlin
+class MyNetworkDriver : HttpNetworkDriver {
+    override suspend fun makeHttpRequest(request: HttpRequest): String {
+        val url = request.url
+        val httpMethod = request.method (should be "POST" for RPC 2.0 requests)
+        val requestHeaders = request.properties
+        val requestBody = reqest.body
+        // networking implementation to submit the HTTP request to the url
+        ...
+        return response string
+    }
+}
+```
+
+### RPC 2.0 Requests
+```kotlin
+// setup RPC driver
+val rpcUrl = "https://api.endpoint.com"
+val rpcDriver = Rpc20Driver(rpcUrl, MyNetworkDriver())
+
+// build RPC request
+val requestId = UUID.generate()
+val requestMehtod = "getTheThing" // the RPC method you want to call
+val requestParameters = buildJsonObject { // this will depend on the method you are calling
+    put("param1", "Hello")
+    put("param2", 1234)
+}
+val rpcRequest = JsonRpc20Request(requestId, requestParamaters, requestId)
+
+// send the request and get response
+// using JsonElement.serializer() will return the JSON RPC response. you can use your own serializer to get back a specific object
+val rpcResponse = rpcDriver.makeRequest(rpcRequest, JsonElement.serializer())
+```
+
+
+
+