Add Java Service Wrapper contribution from Dustin Hawkins

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@1368 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/contribs/wrapper/readme.txt

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+From Dustin Hawkins:
+
+I run two instances of DavMail on my linux desktop to connect to work and university exchange servers. 
+In order to accomplish this, I used the Java Service Wrapper.
+
+Thought I would share my configs in case any one else wanted to run multi-instance under the java service wrapper.
+
+http://wrapper.tanukisoftware.org/doc/english/download.jsp
+
+
+I created  the following directory structure
+
+/opt/davmail
+    bin/
+        wrapper   <-- this is provided by java service wrapper. platform specific native executable.
+        davmail
+        davmail_2
+    lib/
+        <davmail jars>
+        <wrapper static objects/dll's for appropriate platform>
+    conf/
+        wrapper.conf
+        wrapper.conf_2
+        davmail.properties
+        davmail.properties_2
+    logs/
+
+
+The bin/davmail* scripts are the linux start/stop scripts for each instance
+the conf/ directory has two files for each instance, a wrapper.conf, and a davmail.properties.
+
+by linking the bin/davmail* scripts into /etc/init.d and /etc/rc.d, I start davmail as a linux service, 
+and its easily start/stop/restart-able via the standard linux commands.
+
+If you download the Java Service Wrapper, you can find the appropriate executables and start scripts for 
+your platform under <wrapper install dir>/bin
+You can find the correct static object or DLL files under the <wrapper install dir>/lib
+
+I have included a ZIP of my wrapper.conf and davmail startup scripts