added snake game

[ShrishtiSingh26]

Closes: Issue #112

• Title: adding a snake game under games section #112
• Your Name: Shrishti Singh
• Idenitfy yourself: Contributor in gssoc-ext and Hacktoberfest

Describe the add-ons or changes you've made 📃

Give a clear description of what have you added or modifications made Key Points: Game State Management: All the game state (snake, food, direction, etc.) is stored in st.session_state to persist across user actions. Grid Display: The game grid is displayed using emojis (🟩 for the snake and 🍎 for the food), but you can customize this. Movement Control: The player controls the snake with W, A, S, D keys via Streamlit buttons. Game Logic: The snake moves, eats food, grows, and checks for collisions with walls or itself. Restart Option: A restart button re-initializes the game state.

Checklist: ☑️

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

Screenshots 📷

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[ShrishtiSingh26]

@Avdhesh-Varshney resolved the raised issues in PR #117