Docs: Add more content to decoders

[Dishebh]

Describe the solution you'd like

Elaborate the examples given in decoder section, give them some content, truth table, simulations, etc.

Examples of decoders ::
Code converters
BCD to seven segment decoders
Nixie tube decoders
Relay actuator

Would you like to work on it?

Yes

[shubhdeep123]

@Dishebh @YashKumarVerma is anyone working on this issue can I work on this?

[DhairyaBahl]

@YashKumarVerma I cannot see any activity on this page. If this issue is still available kindly assign it to me.

Thanks :)

[jyotsana3108]

If you no one is working on this issue. I would like to work on it

[Me-Priyank]

Outdated