Update README and gitignore

For a more streamined onboarding experience

Author: szarnyasg

.gitignore

@@ -45,3 +45,7 @@ local.properties
 /*.csv
 out/
 datagen_output/
+
+# Hadoop directory extracted as instructed in the Quick Start guide
+/hadoop-2.6.0.tar.gz
+/hadoop-2.6.0/

README.md

@@ -28,15 +28,16 @@ There are three main ways to run Datagen:
 
 ### Pseudo-distributed Hadoop node
 
+To grab Hadoop, extract it, and set the environment values to sensible defaults, and generate the data as specified in the `parameters.ini` file, run the following script:
+
 ```bash
 wget http://archive.apache.org/dist/hadoop/core/hadoop-2.6.0/hadoop-2.6.0.tar.gz
 tar xf hadoop-2.6.0.tar.gz
 export HADOOP_CLIENT_OPTS="-Xmx2G"
 # set this to the Hadoop 2.6.0 directory
-export HADOOP_HOME=
+export HADOOP_HOME=`pwd`/hadoop-2.6.0
 # set this to the repository's directory
-export LDBC_SNB_DATAGEN_HOME=
-cd $LDBC_SNB_DATAGEN_HOME
+export LDBC_SNB_DATAGEN_HOME=`pwd`
 ./run.sh
 ```