watcher and assignee command wrote

src/main/java/cli/CommandLineInterface.java

src/main/java/command/CommandAssign.java

src/main/java/command/CommandSelector.java

src/main/java/command/CommandShow.java

src/main/java/command/CommandWatcher.java

src/main/java/git/IssueReader.java

src/main/java/git/IssueTreeBuilder.java

src/main/resources/ignoreStream.sh