add survey page (#329)

placeholder for customer surveys.

website/docs/support/survey.md

@@ -0,0 +1,10 @@
+---
+id: survey
+title: Support Customer Survey
+---
+
+# Thank you
+
+We know how valuable is your time and really appreciate the feedback on our work.
+<br></br>
+Please answer the two questions below and reach us out if you want to add anything else.