Update README

Author: alexrudall

README.md

@@ -92,6 +92,32 @@ You can alternatively search using the ID of a file you've uploaded:
     client.search(engine: "ada", file: "abc123", query: "happy")
 ```
 
+### Answers
+
+Pass documents, a question string, and an example question/response to get an answer to a question:
+
+```
+    response = client.answers(parameters: {
+        documents: ["Puppy A is happy.", "Puppy B is sad."],
+        question: "which puppy is happy?",
+        model: "curie",
+        examples_context: "In 2017, U.S. life expectancy was 78.6 years.",
+        examples: [["What is human life expectancy in the United States?","78 years."]],
+    })
+```
+
+You can alternatively search using the ID of a file you've uploaded:
+
+```
+    response = client.answers(parameters: {
+        file: "123abc",
+        question: "which puppy is happy?",
+        model: "curie",
+        examples_context: "In 2017, U.S. life expectancy was 78.6 years.",
+        examples: [["What is human life expectancy in the United States?","78 years."]],
+    })
+```
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.