Add warning to GitHub PR template

- https://blog.github.com/2016-02-17-issue-and-pull-request-templates/

Change-Id: I24cfea94187fab1cc9241674598a228c02255a0a
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..bb72172
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,12 @@
+
+ONOS project does not use GitHub features for code contribution.
+
+Please submit a patch to [ONOS gerrit](https://gerrit.onosproject.org/).
+
+You will need to register to submit a patch.
+If you do not have ONOS project account yet, you can create one here
+https://onosproject.org/register/
+
+More information about how you can contribute can be found on the wiki:
+https://wiki.onosproject.org/display/ONOS/Contributor+Guide
+
diff --git a/README.md b/README.md
index e7d5131..65f63d2 100644
--- a/README.md
+++ b/README.md
@@ -110,13 +110,13 @@
 To run ONOS unit tests, including code Checkstyle validation, run the following command:
 
 ```bash
-$ buck test
+$ onos-buck test
 ```
 
 Or more specific tests:
 
 ```bash
-$ buck test [buck-test-rule]
+$ onos-buck test [buck-test-rule]
 ```
 
 ## Contributing