Add release notes file for 2.15

Change-Id: Ieb3963438f0360f10b96ed73efd173a0057d1097

releases/2.15.md

diff --git a/releases/2.15.md b/releases/2.15.md
new file mode 100644
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+++ b/releases/2.15.md
@@ -0,0 +1,21 @@
+# Gerrit 2.15 *(In development)*
+
+[TOC]
+
+## Release Highlights
+
+## Important Notes
+
+### Schema Changes
+
+This release contains schema changes. To upgrade:
+
+``` sh
+  java -jar gerrit.war init -d site_path
+```
+
+## New Features
+
+## Bugfixes
+
+## Dependency Updates

releases/README.md

diff --git a/releases/README.md b/releases/README.md
index a6520a2..19dfa0a 100644
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+++ b/releases/README.md
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 [TOC]
 
+## 2.15 *(In development)* {#2.15}
+
+[Release notes for Gerrit 2.15](/releases/2.15.md)
+
 ## 2.14 *(In development)* {#2.14}
 
 * Changes can be assigned to specific users