Add CI configuration

.genignore

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+meta/

meta/README.md

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+# The meta folder
+
+This folder is ignored via the `.genignore` file. It contains meta files
+that should not make it into the generated project.

meta/appveyor.yml

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+# This CI configuration tests the cosmwasm-template repository itself,
+# not the resulting project. We want to ensure that
+# 1. the template to project generation works
+# 2. the template files are up to date
+#
+# We chose Appveyor for this task as it allows us to use an arbitrary config
+# location. Furthermore it allows us to ship a Circle CI and Travis config
+# generated for the resulting project.
+
+environment:
+  matrix:
+    - TARGET: x86_64-pc-windows-msvc
+      CHANNEL: stable
+    - TARGET: x86_64-pc-windows-msvc
+      CHANNEL: nightly
+
+install:
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - rustup-init.exe --default-host %TARGET% --default-toolchain %CHANNEL% -y
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustc --version
+  - cargo --version
+  - cargo install cargo-generate --features vendored-openssl
+
+build_script:
+  - cargo generate --git . --name TestGenerationInCi
+  - dir
+  - cd TestGenerationInCi
+  - cargo unit-test
+  - cargo wasm
+  - cargo test
+  - cargo schema
+  - cd ..
+
+after_build:
+  - git status