docs: Update README for client method usage

Author: stonexer

README.md

@@ -459,15 +459,20 @@ await client.connect(transport);
 const prompts = await client.listPrompts();
 
 // Get a prompt
-const prompt = await client.getPrompt("example-prompt", {
-  arg1: "value"
+const prompt = await client.getPrompt({
+  name: "example-prompt",
+  arguments: {
+    arg1: "value"
+  }
 });
 
 // List resources
 const resources = await client.listResources();
 
 // Read a resource
-const resource = await client.readResource("file:///example.txt");
+const resource = await client.readResource({
+  uri: "file:///example.txt"
+});
 
 // Call a tool
 const result = await client.callTool({