Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to zchunk-java
+
+Hey, you have opend up this file! Thanks a lot for thinking about contributions!
+
+## Issues
+
+* If it is a format specification problem, please head over to https://github.com/zchunk/zchunk.
+* If you've spotted an implementation error, please be so kind as to deliver a simple test case (or a file which cannot be read).
+
+
+## Pull Requests
+
+Before creating pull requests, please tick these checkboxes in your mind:
+
+ - [ ] Have you started a branch for exactly one issue?
+ - [ ] If this is a PR for a issue, please name it issues/# (e.g. issues/3).
+ - [ ] Before commiting and creating the PR, please execute:
+   - [ ] ./mvnw clean install -DskipTests=true -Pcheckstyle,checker
+   - [ ] ./mvnw -T4 clean install javadoc:jar sources:jar
+
+If it doesn't compile, please fix the errors first. Thank you :)
+