Add Hex Sticker

[harryprince]

conflr is great package to talk to Wiki in my daily job. Wish someone can propose a lovely hex sticker like bookdown logo.

[adtserapio]

Hello sir @harryprince! I hope this hex icon does this R package justice: I made a pull request already.

Here's an zip file containing the SVG and the raw Adobe Illustrator file. :) conflr-logo.zip