add contribution templates

.github/ISSUE_TEMPLATE.md

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+Please specify whether your issue is about:
+
+ - [ ] a possible bug
+ - [ ] a question about package functionality
+ - [ ] a suggested code or documentation change, improvement to the code, or feature request
+
+If you are reporting (1) a bug or (2) a question about code, please supply:
+
+ - [a fully reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) using a publicly available dataset (or provide your data)
+ - if an error is occurring, include the output of `traceback()` run immediately after the error occurs
+ - the output of `sessionInfo()`
+
+Put your code here:
+
+```R
+## load package
+library("dataverse")
+
+## code goes here
+
+
+## session info for your system
+sessionInfo()
+```
+

.github/PULL_REQUEST_TEMPLATE.md

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+Please ensure the following before submitting a PR:
+
+ - [ ] if suggesting code changes or improvements, [open an issue](https://github.com/leeper/dataverse/issues/new) first
+ - [ ] for all but trivial changes (e.g., typo fixes), add your name to [DESCRIPTION](https://github.com/leeper/dataverse/blob/master/DESCRIPTION)
+ - [ ] for all but trivial changes (e.g., typo fixes), documentation your change in [NEWS.md](https://github.com/leeper/dataverse/blob/master/NEWS.md) with a parenthetical reference to the issue number being addressed
+ - [ ] if changing documentation, edit files in `/R` not `/man` and run `devtools::document()` to update documentation
+ - [ ] add code or new test files to [`/tests`](https://github.com/leeper/dataverse/tree/master/tests/testthat) for any new functionality or bug fix
+ - [ ] make sure `R CMD check` runs without error before submitting the PR
+