third_party: add gopkg.in/gomail.v1 (and deps)

The Go Package gopkg.in/gomail.v1 is used to send the automated Vanadium early
access welcome email via $V23_ROOT/infrastructure/signup. Reasons for using this
package over net/mail is simple support for:

* Attachments.
* Alternative format (support both text/html and text/plain messages).

Additionally, a dependency of gopkg.in/gomail.v1 has been added.

* gopkg.in/alexcesaro/quotedprintable.v2

MultiPart: 2/2
Change-Id: If27d33fd008d7d27f116242d56649566d5f343f4
19 files changed
tree: d53c798e898542347c0c8187440d1ae335ffffac
  1. csrc/
  2. go/
  3. java/
  4. nacl_sdk/
  5. .gitignore
  6. README.md
README.md

This repository contains three kinds of code used in the Vanadium project:

  1. code which originated outside of Google
  2. code which Google has released as open source
  3. Vanadium code which is derived from code that originated outside of Google, and is therefore still subject to that original code's third-party license

Most of the code under third-party is open source, though some packages have restrictive commercial licenses.

Because of Go language conventions, Go packages are found under third_party/go/src/.