[CONTENT]: Add content for Medicaps B.Tech CSE 2nd Year 3rd Sem and 4th Year 7th & 8th Sem Notes

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Please add and organize notes content for:

• Medicaps University B.Tech CSE 2nd year, 3rd semester
• Medicaps University B.Tech CSE 4th year, 7th semester
• Medicaps University B.Tech CSE 4th year, 8th semester

Ensure that the content is well-structured and categorized for easy navigation.