can comment, ls, show, create, init with an issue branch

src/main/java/command/CommandComment.java

src/main/java/command/CommandCreate.java

src/main/java/command/CommandInit.java

src/main/java/command/CommandLs.java

src/main/java/command/CommandShow.java

src/main/java/git/IssueReader.java

src/main/java/git/IssueRepo.java

src/main/java/git/IssueTreeBuilder.java

src/main/java/issueData/Comment.java

src/main/java/issueData/Issue.java