Write documentation about the text analyzer

[Barqawiz]

Add a new page in the wiki with "NLP" title and write documentation about the text analyzer features.

The page should include two sub titles:

• Text Summary.
• Sentiment Analysis.

Check the sample to call the related functions from intellinode here:
https://github.com/intelligentnode/IntelliNode/blob/main/samples/command_sample/test_text_analyzer.js

You can test the code with following commands:

cd samples/command_sample
npm install 
node test_text_analyzer.js

To run the script successfully, create .env file with the following values:

OPENAI_API_KEY=<your_openai_api_key>
COHERE_API_KEY=<your_cohere_api_key>

Documentation Template:

NLP

Text Summary
Intro about the function

// how to use code

Sentiment Analysis
Intro about the function

// how to use code