Add issue template outlining feature request / bug reporting guidelines
Add issue template outlining feature request / bug reporting guidelines

This commit adds an [Issue Template](https://github.com/blog/2111-issue-and-pull-request-templates) to this repo alerting users to
the status of features / breaking 1.x changes by the core team, as well
as bug reporting guidelines.

This will hopefully help stabilize the work being done for #4462

material-components/material-components-web,Yizhachok/material-components-web,anton-kachurin/material-components-web,pgbross/material-components-web,material-components/material-components-web,anton-kachurin/material-components-web,material-components/material-components-web,pgbross/material-components-web,Yizhachok/material-components-web