Add basic gradle build settings

.gitignore

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+.gradle
+build
+out
+target

README_gradle.md

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+Build
+=====
+
+Execute the following command
+
+    $ gradlew build
+
+Run
+===
+
+You must create a fat, executable jar. This can be done by invoking
+the following command
+
+    $ gradlew shadowJar
+
+The resulting executable jar will be located at `build/libs`.

build.gradle

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+plugins {
+    id 'java'
+    id 'application'
+    id 'com.github.johnrengelman.shadow' version '1.2.0'
+}
+
+mainClassName = 'libsearch.Main'
+
+repositories {
+    flatDir { dir 'lib' }
+}
+
+dependencies {
+    compile ':commons-cli:1.2'
+}
+
+sourceSets {
+    main.java.srcDirs = files('src')
+}

gradle/wrapper/gradle-wrapper.properties

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+#Wed Dec 10 15:07:46 CET 2014
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.2-bin.zip