Merge pull request #92 from garydgregory/r9_readme_building

Add building section
diff --git a/NOTICE b/NOTICE
index 4d213d7..de4eaf8 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache Juneau
-Copyright 2016-2022 The Apache Software Foundation
+Copyright 2016-2023 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
diff --git a/README.md b/README.md
index 9a8e73d..18ee2ee 100644
--- a/README.md
+++ b/README.md
@@ -51,3 +51,8 @@
    * juneau-rest-server - Any Servlet 3.1.0+ container.
    * juneau-rest-client - Apache HttpClient 4.5+.
 * Built on top of Servlet and Apache HttpClient APIs that allow you to use the newest HTTP/2 features such as request/response multiplexing and server push.
+
+## Building
+Building requires:
+* [Apache Maven](https://maven.apache.org/)
+* Java 17 is required to build, but Java 11 is sufficient to run unless you need Spring.