added travis to build

.travis.yml

@@ -0,0 +1,28 @@
+language: java
+jdk: oraclejdk8
+dist: trusty
+
+# Make the gradle wrapper executable
+# before_install: chmod +x gradlew
+before_install:
+  - wget https://services.gradle.org/distributions/gradle-6.1.1-all.zip
+  - unzip -qq gradle-6.1.1-all.zip
+  - export GRADLE_HOME=$PWD/gradle-6.1.1
+  - export PATH=$GRADLE_HOME/bin:$PATH
+  - gradle -v
+
+script:
+  #- gradle check jacocoTestReport
+  # Also upload test coverage to codecov
+  #- bash <(curl -s https://codecov.io/bash)
+
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+  - rm -f  $HOME/.gradle/caches/*/fileHashes/fileHashes.bin
+  - rm -f  $HOME/.gradle/caches/*/fileHashes/fileHashes.lock
+
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/