Add readme.txt which includes instructions how to build the jar and site.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/logging/trunk@1607019 13f79535-47bb-0310-9956-ffa450edef68

README.txt

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+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+Logging
+-------
+
+Getting started:
+
+1) Build the jar file
+
+  If you have the source distribution you will need to build the jar file
+  using Maven 2/3.  For instructions on downloading and installing Maven see
+  http://maven.apache.org/.
+
+  To build execute the command 'mvn package verify'.
+  The jar file will be built in the target directory.
+  
+  Note: the unit tests are executed during the verify phase and require that
+  the respective jar files have been created successfully.
+
+2) Generate the documentation
+
+  Run the 'mvn verify site' command.  The documentation will be written
+  to the target/site directory.  The documentation has some examples of
+  how to use this package as well as a troubleshooting guide.
+
+3) Create source and binary distributions
+
+  Run the 'mvn verify site assembly:assembly' command.  The source and binary
+  distributions are created in the 'target' directory.
+
+4) Use
+
+  Simply include the jar file built in step #1 in your classpath.  Import the
+  classes that you want to use and you are ready to go!
+