Initial Release Notes for 3.15

- Add docs/community/3.15-announcement.md
- Update docs/community/release-notes.md

Author: math-a3k

docs/community/3.15-announcement.md

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+    float: left;
+    width: 130px;
+    height: 20px;
+    text-align: center;
+    margin: 10px 30px;
+    padding: 150px 0 0 0;
+    background-position: 0 50%;
+    background-size: 130px auto;
+    background-repeat: no-repeat;
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+# Django REST framework 3.15
+
+## Minor fixes and improvements
+
+There are a number of minor fixes and improvements in this release. See the [release notes](release-notes.md) page for a complete listing.

docs/community/release-notes.md

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 ---
 
+## 3.15.x series
+
+### 3.15.0
+
+Date: TBD
+
+* Fix BooleanField's allow_null behavior. [[#8614](https://github.com/encode/django-rest-framework/pull/8614)]
+
 ## 3.14.x series
 
 ### 3.14.0