add proposal document template

Author: gregsdennis

proposals/proposal-template.md

@@ -0,0 +1,88 @@
+# JSON Schema Proposal: <TODO>
+
+## Abstract
+
+<!--
+Fill in the specification(s) that will change.  If adding a keyword, which vocabulary
+will contain it?
+
+For example
+
+    This document proposes a change to the JSON Schema Core specification and
+    Applicator vocabulary by adding the `propertyDependencies` keyword.
+
+-->
+
+This document proposes a change to the ??? specification by adding ???.
+
+## Note to Readers
+
+<!--
+It would be a good idea to isolate the issues that discuss the feature by
+updating the link below to include a query.
+-->
+
+The issues list for this proposal can be found at
+<https://github.com/json-schema-org/json-schema-spec/issues>.
+
+For additional information, see <https://json-schema.org/>.
+
+To provide feedback, use this issue tracker or any of the communication methods
+listed on the homepage.
+
+## Table of Contents
+
+## Conventions and Terminology
+
+All conventions and terms used and defined by the JSON Schema Core specification
+also apply to this document.
+
+## Overview
+
+### Problem Statement
+
+<!-- What problem exists that needs solving? -->
+
+### Solution
+
+<!-- What is the solution? -->
+
+### Alternatives
+
+<!-- What other options have been considered? (summary, not detailed) -->
+
+### Limitations
+
+<!-- Are there any limitations inherent to the proposal? -->
+
+### Examples
+
+<!-- How will this feature be used? -->
+
+## Proposal
+
+### Target for Change
+
+<!--
+Where does this change go?
+
+For example
+
+    This proposal will add the {{propertyDependencies}} section contained herein as
+    a subsection of JSON Schema Core, section 10.2.2 "Keywords for Applying
+    Subschemas Conditionally."
+
+-->
+
+This proposal will add the {{???}} section contained herein as
+a subsection of ???.
+
+### ???
+
+<!-- What is the text that will appear in the specification? -->
+
+## Champions
+
+| Champion                   | Company | Email                   | URI                              |
+|----------------------------|---------|-------------------------|----------------------------------|
+| Your Name                  |         |                         | < GitHub profile page >          |