Added instructions for using this project's code in another project

README.md

@@ -98,4 +98,24 @@ code that uses data from [OpenWeathermap.org](https://openweathermap.org).
 - Three-hour rain (and three-hour snow) total defaults to the 1-hour rain (snow)
   when a separate 3-hour value is not reported. Recent real-world data calls
   into question the assumption that a 3-hour value will be reported when rain
-  has fallen for more than an hour (or even more than three hours)
\ No newline at end of file
+  has fallen for more than an hour (or even more than three hours)
+
+### Use in Your Project
+
+#### JavaDoc
+
+You can generate the JavaDoc pages for publicly-accessible elements by invoking
+the `javadoc:javadoc` Maven target from your IDE or from the command line:
+```
+mvn javadoc:javadoc
+```
+Open the file `target/site/apidocs/index.html` in your web browser to use the
+JavaDoc pages.
+
+#### Maven notes
+
+If you copy the classes and interface from this project into your own, be sure
+that:
+- Your `pom.xml` file specifies Java version 11 or later
+- Your `pom.xml` file includes a dependency for
+  [JSON.simple](https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple)
\ No newline at end of file

pom.xml

@@ -29,7 +29,6 @@
                 <configuration>
                     <show>public</show>
                     <source>11</source>
-                    <target>11</target>
                 </configuration>
             </plugin>
         </plugins>