Add Java 8 sub project

Author: Ndiritu

java-8/.gitignore

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+.gradle
+build/

java-8/build.gradle

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+plugins {
+    // Apply the java-library plugin to add support for Java Library
+    id 'java-library'
+    id 'eclipse'
+}
+
+repositories {
+    mavenCentral()
+}
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['../src']
+            exclude 'test/**'
+        }
+    }
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(8)
+    }
+    withSourcesJar()
+}
+
+apply from: "../gradle/dependencies.gradle"

java-8/gradle.properties

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+mavenArtifactId      = msgraph-sdk-java-core

java-8/settings.gradle

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+rootProject.name = 'msgraph-sdk-java-core'