categories for annotation started to implement

...am/gf/modules/assessment/controller/model/Categories.java

.../src/main/java/unipotsdam/gf/modules/project/Project.java

...potsdam/gf/modules/submission/view/SubmissionService.java

gemeinsamforschen/src/main/webapp/project/create-project.jsp

...nsamforschen/src/main/webapp/project/js/create-project.js

gemeinsamforschen/src/main/webapp/project/js/tasks.js

gemeinsamforschen/src/main/webapp/project/tasks-student.jsp

gemeinsamforschen/src/main/webapp/taglibs/js/fileStorage.js

gemeinsamforschen/src/main/webapp/taglibs/timeLine.jsp