NEP: Security Token Standard

[joeqian10]

Security Token Standard draft created by the collaboration of Liquefy and NGD.

[WyattMufson]

@joeqian10 I opened a pull request to clean up some of the grammar/spelling: https://github.com/joeqian10/proposals/pull/1

[joeqian10]

@WyattMufson PR merged and thanks for reviewing it.

[joeqian10]

@vncoelho I had the same feeling with you at first since we don't have a standard for partially fungible token (PFT). Security tokens (ST) are basically partially fungible tokens. When we start to create this ST standard, we have two ways: the first is to create a PFT standard and a ST standard based on it; the second is to use existing standards. Finally we chose the second one and came up this Main-Sub Standard idea.

[corollari]

Submitted a PR fixing some typos.

[joeqian10]

@corollari 一丁, thank you, and your PR is merged.

[erikzhang]

All management methods should be removed from the standard.