Added quizes for flip-flop,clock-signals,counters and register

[Kartikay304]

Fixes #617

Changes done:

Added quizes for

• [X] Flip-flops
• [X] Counters
• [X] Clock-signals
• [X] Resistor

Screenshots

Flip-Flop:

Resistor:

Counter:

Clock-Signals:

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• [x] Checked to see if a similar PR has already been opened 🤔️
• [x] Reviewed the contributing guidelines 🔍️
• [x] Sample preview link added (add the link(s) for all the pages changed/updated from the checks tab after checks complete)
• [x] Tried Squashing the commits into one

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