add missing license file based on pom.xml (#509)

* add missing license file based on pom.xml

* fix according to PR review

Co-authored-by: Bkocsan <Bkocsan@users.noreply.github.com>

Author: Bkocsan

LICENSE.txt

@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2016, CloudBees, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE. 

pom.xml

@@ -1,27 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!--
- ~ The MIT License
- ~
- ~ Copyright (c) 2016, CloudBees, Inc.
- ~
- ~ Permission is hereby granted, free of charge, to any person obtaining a copy
- ~ of this software and associated documentation files (the "Software"), to deal
- ~ in the Software without restriction, including without limitation the rights
- ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- ~ copies of the Software, and to permit persons to whom the Software is
- ~ furnished to do so, subject to the following conditions:
- ~
- ~ The above copyright notice and this permission notice shall be included in
- ~ all copies or substantial portions of the Software.
- ~
- ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- ~ THE SOFTWARE.
-  -->
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>