Add issue templates
Arguments
- issue
- A character value of type of issue template to create. Choices are "initial-cran-release", "update-cran-release", "submission-cran", and "acceptance-cran". 
- path
- Path to file to add issue template into. Set to ".github/ISSUE_TEMPLATE" which is the default location specified by GitHub. 
- overwrite
- Logical. If an existing issue template with the same file name is found, should it be overwritten? Default to FALSE. 
Examples
if (interactive()) add_issue_template("initial-cran-release")
