added travis config

Author: kaifox

.travis.yml

@@ -0,0 +1,23 @@
+language: java
+jdk:
+  - openjdk8
+  - openjdk11
+before_install:
+  - chmod +x ./gradlew
+script:
+  - ./gradlew check javadoc --stacktrace
+  - ./gradlew jacocoTestReport
+before_deploy:
+  - ./gradlew generateLicenseReport
+  - ./gradlew javadoc
+  - echo $SIGNING_KEY_SECRING_BASE64 | base64 --decode > ./signing.key.secring
+  - export SIGNING_KEY_PATH=./signing.key.secring
+deploy:
+  - provider: script
+    skip_cleanup: true
+    script: ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository -DDEPLOYMENT=true
+    on:
+      tags: true
+      jdk: openjdk11
+after_success:
+  - bash <(curl -s https://codecov.io/bash)