Add contributing instructions.

Change-Id: I9fe9bd339f2aacb04394259ee8753dbc8e041430
Reviewed-on: https://swiftshader-review.googlesource.com/5340
Reviewed-by: Shannon Woods <shannonwoods@google.com>
Tested-by: Nicolas Capens <capn@google.com>

diff --git a/CONTRIBUTING.txt b/CONTRIBUTING.txt
new file mode 100644 (file)
index 0000000..b717d67
--- /dev/null
+++ b/CONTRIBUTING.txt
@@ -0,0 +1,26 @@
+Want to contribute? Great! First, read this page (including the small print at the end).\r
+\r
+### Before you contribute\r
+Before we can use your code, you must sign the\r
+[Google Individual Contributor License Agreement]\r
+(https://cla.developers.google.com/about/google-individual)\r
+(CLA), which you can do online. The CLA is necessary mainly because you own the\r
+copyright to your changes, even after your contribution becomes part of our\r
+codebase, so we need your permission to use and distribute your code. We also\r
+need to be sure of various other things\97for instance that you'll tell us if you\r
+know that your code infringes on other people's patents. You don't have to sign\r
+the CLA until after you've submitted your code for review and a member has\r
+approved it, but you must do it before we can put your code into our codebase.\r
+Before you start working on a larger contribution, you should get in touch with\r
+us first through the issue tracker with your idea so that we can help out and\r
+possibly guide you. Coordinating up front makes it much easier to avoid\r
+frustration later on.\r
+\r
+### Code reviews\r
+All submissions, including submissions by project members, require review.\r
+\r
+### The small print\r
+Contributions made by corporations are covered by a different agreement than\r
+the one above, the\r
+[Software Grant and Corporate Contributor License Agreement]\r
+(https://cla.developers.google.com/about/google-corporate).
\ No newline at end of file