new INSTALL guide

This document is written to be more user-friendly, and results in a working instance of Libresonic as a Tomcat web app. Includes instructions from source, as well as pre-compiled war.

Signed-off-by: alexfornuto <alex@fornuto.com>

INSTALL.md

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+<!--
+# INSTALL.md
+# Libresonic/libresonic
+-->
+
+# Installing Libresonic
+
+This document is designed to explain how to install LibreSonic as a Tomcat module, on a computer running Linux. As the project expands, this guide will also expand to include other operating systems.
+
+## Installing From Pre-Compiled Package
+
+### Prerequisites
+
+In order to install and run Libresonic, you will need:
+
+  * A JDK installation. 1.8.x series of OpenJDK or Oracle JDK 8+ should work.
+  * A running [Tomcat](http://tomcat.apache.org/) server. If you're unfamiliar with Tomcat, there are many [guides](https://www.linode.com/docs/websites/frameworks/apache-tomcat-on-ubuntu-16-04) on it.
+
+
+### Download Libresonic
+
+Daily WAR files are built by Jenkins and available [here](https://jenkins.zifnab.net/job/libresonic/), curtesy of [zifnab06](https://github.com/zifnab06).
+
+1.  Download the latest war file:
+
+		wget https://jenkins.zifnab.net/job/libresonic/lastSuccessfulBuild/artifact/.repository/org/libresonic/player/libresonic-main/6.1.beta1/libresonic-main-6.1.beta1.war -O /var/lib/tomcat8/webapps/libresonic.war
+
+	Note that this command copies the war file directly to the Tomcat webapps directory, and renames it to `libresonic.war`.
+
+2.  Create the libresonic directory and assign ownership to the Tomcat system user (if running tomcat as a service):
+
+		mkdir /var/libresonic
+		chown tomcat8:tomcat8 /var/libresonic/
+
+3.  Start Tomcat, or restart it if running as a service, as in the example below using Systemd:
+
+		systemctl restart tomcat8.service
+
+	Note that it may take ~30 seconds after the service restarts for Tomcat to fully deploy the app. You can monitor /var/log/tomcat8/catalina.out for the following message:
+
+		INFO: Deployment of web application archive /var/lib/tomcat8/webapps/libresonic.war has finished in 46,192 ms
+
+4.  In your web browser, navigate to `192.0.2.10:8080/libresonic/`, replacing `192.0.2.0` with your server's IP address, or `127.0.0.1` if installing locally.
+
+## Installing From Source
+
+### Prerequisites
+
+In order to build, install, and run Libresonic, you will need:
+
+  * A recent version of [Maven](http://maven.apache.org/).
+  * A JDK installation. 1.8.x series of OpenJDK or Oracle JDK 8+ should work.
+  * A running [Tomcat](http://tomcat.apache.org/) server. If you're unfamiliar with Tomcat, there are many [guides](https://www.linode.com/docs/websites/frameworks/apache-tomcat-on-ubuntu-16-04) on it.
+
+On a Debian-based system, you can install all these prerequisites at once with:
+
+	apt-get update; apt-get install tomcat8 openjdk-7-jdk maven
+
+### Test Your System
+
+1.  Confirm your Maven installation:
+
+		which mvn
+
+2.  Confirm that the $JAVA_HOME environment variable is set:
+
+		echo $JAVA_HOME
+
+3.  If Java is installed, but the `JAVA_HOME` variable not set, be sure to [set it](http://www.cyberciti.biz/faq/linux-unix-set-java_home-path-variable/) before you continue.
+
+
+### Download and Build Libresonic
+
+1.  Clone the Libresonic repo:
+
+		git clone git://github.com/Libresonic/libresonic.git
+		cd libresonic
+
+	If you don't have a GitHub account, use https://github.com/Libresonic/libresonic.git instead.
+
+2.  At the time of this writing, we reccomend building from the development branch, as Libresonic has not had a stable release since being forked.
+
+		git checkout develop
+
+3.  Using Maven, build Subsonic:
+
+		mvn package
+
+4.  You should know have a war file:
+
+		ls libresonic-main/target/libresonic.war 
+		libresonic-main/target/libresonic.war
+
+5.  Copy the war file to the Tomcat webapps directory:
+
+		cp libresonic-main/target/libresonic.war /var/lib/tomcat8/webapps
+
+6.  Create the libresonic directory and assign ownership to the Tomcat system user (if running tomcat as a service):
+
+		mkdir /var/libresonic
+		chown tomcat8:tomcat8 /var/libresonic/
+
+7.  Start Tomcat, or restart it if running as a service, as in the example below using Systemd:
+
+		systemctl restart tomcat8.service
+
+	Note that it may take ~30 seconds after the service restarts for Tomcat to fully deploy the app. You can monitor /var/log/tomcat8/catalina.out for the following message:
+
+		INFO: Deployment of web application archive /var/lib/tomcat8/webapps/libresonic.war has finished in 46,192 ms
+
+8.  In your web browser, navigate to `192.0.2.10:8080/libresonic/`, replacing `192.0.2.0` with your server's IP address, or `127.0.0.1` if installing locally.