Added explanation and scratch implementation of RNNs (#134)

[kashifalikhan36]

Pull Request

• Title: Added Documentation and Example Code for Recurrent Neural Networks (RNNs)
• Your Name: Kashif Ali Khan
• SWOC, Contributor

Issue:- #134

I have added a detailed markdown file documenting Recurrent Neural Networks (RNNs), their architecture, key concepts, and popular variants (Basic RNN, LSTM, GRU, and Bidirectional RNN). The documentation includes a Python code example for implementing a simple RNN using TensorFlow/Keras, as well as visualizations for training metrics like accuracy and loss. This contribution aims to enhance the learning resources in the repository.

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

[github-actions]

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[Avdhesh-Varshney]

@kashifalikhan36 Sorry but you have forked the wrong branch.

• Always fork main branch, create patch-1.
• Then raise your pr.

I'm updating the Algorithm README Template. Wait for tomorrow.