Readme update as257 (#85)

* Updated README with edits per AS-257

1. Updated README contents.
2. Added sample image

* Removed unnecessary text

Changed ` [code block: `server/llmManager.js`]` to  `server/llmManager.js`

Author: DavidEGutierrez

webviewer-ask-ai/README.md

@@ -1,13 +1,17 @@
 # WebViewer - Ask AI sample
 
-[WebViewer](https://docs.apryse.com/web/guides/get-started) is a powerful JavaScript-based PDF Library that is part of the [Apryse SDK](https://apryse.com/).
+Add an AI-powered assistant to WebViewer, enabling chat-based Q&A, document and selected-text summarization, keyword extraction, and contextual prompts that lets users ask questions about their PDFs. 
+
+
+[WebViewer](https://apryse.com/products/webviewer) is a powerful JavaScript-based PDF Library that is part of the [Apryse SDK](https://apryse.com/).
 
 - [WebViewer Documentation](https://docs.apryse.com/web/guides/get-started)
 - [WebViewer Demo](https://showcase.apryse.com/)
 
-This sample demonstrates how to utilize the artificial intelligence capabilities within the WebViewer, using a chat panel interface to ask questions about the loaded document. Also the user can select text to summarize.
+    ![sample document](sample-document.png "sample document")
+
 
-## Get your trial key
+## Getting started
 
 A license key is required to run WebViewer. You can obtain a trial key in our [get started guides](https://docs.apryse.com/web/guides/get-started), or by signing-up on our [developer portal](https://dev.apryse.com/).
 
@@ -25,9 +29,7 @@ npm install
 
 ## Configuration
 
-This sample uses OpenAI. You can use any other artificial intelligence of your choice.
-
-However, to get started with this sample rename `.env.example` file into `.env` and fill the followings:
+OpenAI is the default backend for this sample. To get started, rename `.env.example` file into `.env` and fill the following: 
 
 ```
 OPENAI_API_KEY=your-openai-api-key-here
@@ -37,6 +39,8 @@ OPENAI_TEMPERATURE=your-openai-temperature-here
 OPENAI_SEED=your-openai-seed-here
 ```
 
+To use another model, replace the LangChain provider in `server/llmManager.js`, install the corresponding provider package, and update the `.env` variables for that model provider. 
+
 ## Run
 
 ```