add appveyor.yml file to repo

appveyor.yml

@@ -0,0 +1,65 @@
+version: 1.0.{build}
+branches:
+  only:
+  - nightly
+image: Visual Studio 2017
+platform: Any CPU
+clone_depth: 1
+init:
+- cmd: ''
+install:
+- cmd: >-
+    git submodule update --init --recursive
+
+    set QTDIR=C:\Qt\5.11\msvc2017_64
+
+    set PATH=%PATH%;%QTDIR%\bin
+
+    call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
+build_script:
+- cmd: >-
+    curl -fsS -o openssl.7z https://pajlada.se/files/openssl.7z
+
+    7z x openssl.7z
+
+    dir
+
+    mkdir build
+
+    cd build
+
+    qmake ../chatterino.pro BOOST_DIRECTORY="C:\Libraries\boost_1_64_0" BOOST_LIB_SUFFIX="lib64-msvc-14.1" OPENSSL_DIRECTORY="%APPVEYOR_BUILD_FOLDER%\openssl"  DEFINES+="CHATTERINO_NIGHTLY_VERSION_STRING=\\\"$$system(git describe --always)-$$system(git rev-list master --count)\\\""
+
+    set cl=/MP
+
+    nmake /S /NOLOGO
+
+    git clone https://github.com/pajlada/chatterino2-dlls.git
+
+    mkdir Chatterino2
+
+    cp ../openssl/bin/libcrypto*.dll ../openssl/bin/libssl*.dll Chatterino2/
+
+    cp chatterino2-dlls/*.dll Chatterino2/
+
+    windeployqt release/chatterino.exe --release --no-compiler-runtime --no-translations --no-opengl-sw --dir Chatterino2/
+
+    cp release/chatterino.exe Chatterino2/
+
+    7z a chatterino2.zip Chatterino2/
+artifacts:
+- path: build/chatterino2.zip
+  name: chatterino2
+deploy:
+- provider: GitHub
+  tag: nightly-win
+  release: nightly-win
+  description: 'nightly v$(appveyor_build_version) built $(APPVEYOR_REPO_COMMIT_TIMESTAMP)\nLast change: $(APPVEYOR_REPO_COMMIT_MESSAGE) \n$(APPVEYOR_REPO_COMMIT_MESSAGE_EXTENDED)'
+  auth_token:
+    secure: sAJzAbiQSsYZLT+byDar9u61X0E9o35anaPMSFkOzdHeDFHjx1kW4cDP/4EEbxhx
+  repository: fourtf/chatterino2
+  artifact: build/chatterino2.zip
+  prerelease: true
+  force_update: true
+  on:
+    branch: nightly