Add AppVeyor CI configuration

Cargo.toml

@@ -11,6 +11,7 @@ version     = "0.2.0"
 [badges]
 # gitlab      = { repository = "valeth/discord-rpc-client.rs" }
 travis-ci   = { repository = "valeth/discord-rpc-client.rs" }
+appveyor    = { repository = "valeth/discord-rpc-client.rs", service = "gitlab" }
 maintenance = { status = "experimental" }
 
 [dependencies]

README.md

@@ -1,4 +1,4 @@
-[![Build Status][travis-ci-badge]][travis-ci-page] [![crates.io][crates-io-badge]][crates-io-page]
+[![Build Status][travis-ci-badge]][travis-ci-page] [![Build status][appveyor-ci-badge]][appveyor-ci-page] [![crates.io][crates-io-badge]][crates-io-page]
 
 # Discord RPC Client
 
@@ -34,5 +34,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md)
 [crates-io-page]: https://crates.io/crates/discord-rpc-client
 [travis-ci-badge]: https://travis-ci.org/valeth/discord-rpc-client.rs.svg?branch=master
 [travis-ci-page]: https://travis-ci.org/valeth/discord-rpc-client.rs
+[appveyor-ci-badge]: https://ci.appveyor.com/api/projects/status/3fba86eipx0sgsjp?svg=true
+[appveyor-ci-page]: https://ci.appveyor.com/project/valeth/discord-rpc-client-rs
 [discord-invite]: https://discordapp.com/invite/zfavwrA
 [discord-banner]: https://discordapp.com/api/guilds/200751504175398912/widget.png?style=banner2

appveyor.yml

@@ -0,0 +1,19 @@
+version: 1.0.{build}
+
+environment:
+  matrix:
+    - TARGET: x86_64-pc-windows-msvc
+
+install:
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain stable
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustup -V
+  - cargo -V
+
+clone_depth: 1
+
+build: false
+
+test_script:
+  - cargo test