docs/README.md: to render nicer pages on github

![curl logo](https://cdn.rawgit.com/curl/curl-www/master/logo/curl-logo.svg)

# Documentation

You'll find a mix of various documentation in this directory and

subdirectories, using several different formats. Some of them are not ideally

for reading directly in your browser.

If you rather see the rendered version of the documentation, check out the

curl web site's [documentation section](https://curl.haxx.se/docs/) for

general curl stuff or the [libcurl section](https://curl.haxx.se/libcurl/) for

libcurl related documentation.