CI for windows

[richardschneider]

Could we also run the build on appveyor?

[dignifiedquire]

@richardschneider I have added appveyor for

• https://ci.appveyor.com/project/dignifiedquire/js-datastore
• https://ci.appveyor.com/project/dignifiedquire/interface-datastore
• https://ci.appveyor.com/project/dignifiedquire/js-datastore-core
• https://ci.appveyor.com/project/dignifiedquire/js-datastore-fs
• https://ci.appveyor.com/project/dignifiedquire/js-datastore-level

could you take care of PRing the appropriate badges for the readmes please?

[richardschneider]

I can't do it because I need access to the project badge settings. This page has the badge url.

[daviddias]

Being added with #3

Thanks @dignifiedquire for enabling it :)