expanded readme

README.md

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 # Sunbeam TCP Relay v0.1
 #### Elizabeth Evelene Amelia Diode, June 2019
 #### AGPL v3
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 ### Oh no, what is it this time?
 Sunbeam is a simple and fast multi-endpoint TCP relay for  
 for um  
 we swear we had a perfectly reasonable use in mind, but we honestly can't remember it now.  
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 ### What it does
 Sunbeam is a little tiny server that passes data between TCP connections.
 
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 General usage looks like the following:  
 `sunbeam [-l] [local port] [remote address]:[port]`  
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 ### How to block IP addresses
 It's 2019, and a server that can't filter incoming connections is a server that belongs to The
 Enemy. That's why Sunbeam, minimal as it is, includes this functionality nonetheless.  
 You can create the file `.nosunbeam` in the directory where Sunbeam runs. Sunbeam will read it,
 parse each line as an IP address (v4 or v6 are both fine), and immediately drop any incoming
 connections from those addresses. 
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 ### Why you can't give it domain names
 Rust has a minimal stdlib. One consequence of this is the fact that there's no way to resolve a
 domain name using only stdlib, without writing and entire DNS client yourself. We admit we don't
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 former. As a result, you'll have to do your DNS resolution some other way, like by running `dig`
 at the command line to look up the IP address for the domain you want. Yes, it's clunky, but
 ergonomics are not really the biggest problem this program has either.
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 ### Why it's called that
 This program is called "Sunbeam" because of a particular plot device that we thought was clever
 in the sci-fi novel *The Three Body Problem* by Cixin Liu. A character discovers that, due to a