Changes to CONTRIBUTING.md. All files

CONTRIBUTING.md

new file mode 100644@@ -0,0 +1,15 @@+# How to contribute to ack++## Requesting new filetypes++We get many requests for new filetypes.  Not all filetypes will necessarily be added to ack.++If you'd like to suggest a new filetype for ack, please create an issue that includes:++* The name of the filetype+* What the definition of the filetype would be, taken from the `.ackrc` file that you've been using.+* URL of a web page that discusses what the filetype is+* What the file contains, and why it should be a filetype+* How widely used this filetype will be.++Please do not create a pull request for it.