Added explicit details and solidity wrappers for precompiled contract at addresses 0x1 - 0x3

[PaulElisha]

Proposed changes

I added high-level details of precompiled contracts for easy comprehension.
I explicitly added solidity wrappers to precompiled contracts at the first four addresses for easy understanding/application.

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• Minor Issues and Typos
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Related issues

• PR Added explicit details and solidity wrappers for precompiled contract at addresses 0x1 - 0x3 #698

Further comments

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[scott-klaytn]

@PaulElisha Please post "I have read the CLA Document and I hereby sign the CLA" in a comment as shown by CLA Assistant bot.

[PaulElisha]

I have read the CLA Document and I hereby sign the CLA

[PaulElisha]

@PaulElisha Please post "I have read the CLA Document and I hereby sign the CLA" in a comment as shown by CLA Assistant bot.

I have done that.