Create ODPI-Hadoop-Installation.md

Added first Content for ODPi Hadoop installation

Signed-off-by: Robert Wolff <robert.wolff@linaro.org>

Reference-Platform/EnterpriseEdition/ODPI-Hadoop-Installation.md

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+This post concentrates on installing ODPi components built using Apache BigTop. These steps configure and run the components on a single node.
+
+# Prerequisites:
+
+* Java 7 (e.g. openjdk-7-jre)
+
+# Repo:
+
+ODPi deb and rpm packages can be found on Linaro repositories:
+
+* Debian Jessie - http://repo.linaro.org/ubuntu/linaro-overlay/
+* CentOS 7 - http://repo.linaro.org/rpm/linaro-overlay/centos-7/
+
+
+# Installation :
+
+### On Debian:
+
+Add to repo source list (**not required if you are using the installer from the Reference Platform**):
+
+```shell
+echo "deb http://repo.linaro.org/ubuntu/linaro-overlay jessie main" | sudo tee /etc/apt/sources.list.d/linaro-overlay-repo.list
+sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E13D88F7E3C1D56C
+```
+
+Update the source list and install the dependencies:
+
+```shell
+sudo apt-get update
+sudo apt-get install openssh-server rsync openjdk-7-jre openjdk-7-jdk
+sudo apt-get build-dep build-essential
+```
+
+Install Hadoop packages:
+
+```shell 
+sudo apt-get install -ft jessie bigtop-tomcat bigtop-utils hadoop* spark* hue* zookeeper* hive* hbase* oozie* pig* mahout*
+```
+
+### On CentOS:
+
+```shell
+sudo wget http://repo.linaro.org/rpm/linaro-overlay/centos-7/linaro-overlay.repo -O /etc/yum.repos.d/linaro-overlay.repo
+sudo yum update
+sudo yum -y install openssh-server openssh-clients java-1.7.0-openjdk*
+sudo yum install -y bigtop-tomcat bigtop-utils hadoop* spark* hue* zookeeper* hive* hbase* oozie* pig* mahout*
+```
+
+### Verifying Installation 
+
+Packages would get installed in /usr/lib 
+
+Type hadoop to check if hadoop is installed:
+
+```shell
+hadoop
+```
+
+And you should see the following:
+
+```shell
+linaro@debian:~$ hadoop
+Usage: hadoop [--config confdir] COMMAND
+       where COMMAND is one of:
+  fs                   run a generic filesystem user client
+  version              print the version
+  jar <jar>            run a jar file
+  checknative [-a|-h]  check native hadoop and compression libraries availability
+  distcp <srcurl> <desturl> copy file or directories recursively
+  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive
+  classpath            prints the class path needed to get the
+  credential           interact with credential providers
+                       Hadoop jar and the required libraries
+  daemonlog            get/set the log level for each daemon
+  trace                view and modify Hadoop tracing settings
+ or
+  CLASSNAME            run the class named CLASSNAME
+```
+     
+    Most commands print help when invoked w/o parameters.
+
+Next Step: [Setup, Configuration and Running Hadoop](https://github.com/linaro/documentation/wiki/ODPi-BigTop-Hadoop-configuration-and-Running)