Separate nebula algorithm from nebula-spark-utils

.github/workflows/ISSUE_TEMPLATE.md

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+#### Expected behavior
+
+#### Actual behavior
+
+#### Steps to reproduce
+
+#### JVM version (e.g. `java -version`)
+
+#### Scala version (e.g. `scala -version`)
+
+#### OS version (e.g. `uname -a`)

.github/workflows/PULL_REQUEST_TEMPLATE.md

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+Motivation:
+
+Why you're making that change and what is the problem you're trying to solve.
+
+Modification:
+
+Describe the modifications you've done.
+
+Result:
+
+Fixes #<GitHub issue number>.

.github/workflows/maven.yml

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+# This workflow will build a Java project with Maven
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches:
+      - master
+      - 'v[0-9]+.*'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+
+    - name: Cache the Maven packages to speed up build
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-maven-
+
+    - name: Build with Maven
+      run: mvn -B package

.gitignore

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+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# build target
+target/
+
+# IDE
+.idea/
+.eclipse/
+*.iml
+
+spark-importer.ipr
+spark-importer.iws
+
+# mac
+.DS_Store

.scalafmt.conf

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+align = more
+maxColumn = 100
+docstrings = ScalaDoc
+assumeStandardLibraryStripMargin = true

.travis.yml

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+# Copyright (c) 2020 vesoft inc. All rights reserved.
+#
+# This source code is licensed under Apache 2.0 License,
+# attached with Common Clause Condition 1.0, found in the LICENSES directory.
+
+language: java
+
+jdk:
+  - oraclejdk11
+  - openjdk8
+  - openjdk11
+
+install: mvn clean compile package install -Dgpg.skip -Dmaven.javadoc.skip=true

LICENSES/Apache-2.0.txt

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LICENSES/CC-1.0.txt

@@ -0,0 +1,14 @@
+"Commons Clause" License Condition v1.0
+
+The Software is provided to you by the Licensor under the License, as defined below, subject to the following condition.
+
+Without limiting other conditions in the License, the grant of rights under the License will not include, and the License does not grant to you, the right to Sell the Software.
+
+For purposes of the foregoing, "Sell" means practicing any or all of the rights granted to you under the License to provide to third parties, for a fee or other considerationon (including without limitation fees for hosting or consulting/support services related to the Software), a product or service whose value derives, entirely or substantially, from the functionality of the Software. Any license notice or attribution required by the License must also include this Commons Clause License Condition notice.
+
+Software: Nebula Graph [Software in this repository]
+
+License: Apache 2.0 [https://www.apache.org/licenses/LICENSE-2.0.html]
+
+Licensor: vesoft inc.
+