Update issue templates

Author: japamment

.github/ISSUE_TEMPLATE/standard-name-template.md

@@ -0,0 +1,20 @@
+---
+name: Standard name template
+about: For proposing changes to the standard names table, area types table or standardized
+  region list.
+title: " Standard names: *add your own title here*"
+labels: standard name
+assignees: ''
+
+---
+
+Before submitting an issue be sure you have read and understood the rules for vocabulary changes: http://cfconventions.org/standard_name_rules.html
+
+Change proposals should include the following information as applicable.
+
+**Proposer's name** This information will be used to add entries to the vocabulary editor: http://cfeditor.ceda.ac.uk/proposals/1. If you prefer not to add your name, your github id will be used instead.
+**Date** Also used in the vocabulary editor.
+For each term please try to give the following:
+**- Term** Proposed term to appear in the vocabulary
+**- Definition** A brief definition to explain the meaning of the term
+**- Units** (If applicable).