Add Contributing Guidelines

CONTRIBUTING.md

@@ -0,0 +1,19 @@
+Contributing to JSONView
+---
+
+The goal of JSONView is to be a very simple, straightforward add-on that formats JSON. Given that, even though I'm very appreciative of the time and thought put into contributions, I regularly reject them because they add complexity to the add-on that I don't think should be there. Please consider [filing an issue](https://github.com/bhollis/jsonview/issues) before doing any work, so you don't accidentally waste time on something I won't accept.
+
+There are no hard and fast rules for what I will and will not accept - please just ask via an issue before implementing. Generally, things I have rejected in the past:
+
+* Adding new MIME types to the set supported by JSONView. I have [an open issue](https://github.com/bhollis/jsonview/issues/7) for how I'd like to see additional MIME types handled, and will not accept patches that add arbitrary new MIME types.
+* Adding new options. While I'm not opposed to adding an option if it really makes sense, the bar is very high for adding anything configurable to the add-on.
+* Interpreting JSON in any application-specific way. While in the past I've allowed a few feature additions that attempt to interpret JSON (such as recognizing and linkifying URLs), I want JSONView to be a general JSON viewer, and as such will reject any patch that seeks to priviledge specific interpretations of JSON structure.
+* Adding switches or options to the screen that shows JSON. I don't want to clutter up the JSON view itself with control panels and options, so anything that relies on adding such a thing is likely to be rejected.
+
+Please, don't let this discourage you! Just file an issue first so we can discuss the change you plan to make.
+
+
+Code Guidelines
+---
+
+Please match the formatting of existing code - that includes whitespace, documentation, code style, and naming conventions. Look at the code around your patch and just copy that style.

README.md

@@ -18,6 +18,9 @@ Use the GitHub [Issue tracker for JSONView](https://github.com/bhollis/jsonview/
 
 Developing JSONView
 -------------------
+
+Before contributing to JSONView, make sure to read the [Contributing Guidelines](CONTRIBUTING.md). I appreciate contributions people make to JSONView, but the goal of the add-on is to be simple and straightforward, so I frequently reject contributions that add complexity or unnecessary features. Please consider filing an issue before doing any work, so you don't waste time on something I won't accept.
+
 * Install [Add-on SDK](https://developer.mozilla.org/en-US/Add-ons/SDK)
 * Make sure the SDK Virtual Environment is activated by running `cfx` from shell prompt.
 * Run `python build.py run` or `cfx run` to test in Firefox.
@@ -28,9 +31,9 @@ The build script also comes with a HTTP server which can be used to test JSON fi
 
 Unofficial Ports
 ----------------
-* [jsonview-safari](https://github.com/acrogenesis/jsonview-safari)
 * [jsonview-chrome](https://github.com/jamiew/jsonview-chrome)
 * [jsonview-opera](https://github.com/fearphage/jsonview-opera)
+* [jsonview-safari](https://github.com/acrogenesis/jsonview-safari)
 
 Common Issues
 -------------