fix: changed interfaces

gemeinsamforschen/src/main/java/unipotsdam/gf/interfaces/IProjectDescription.java

-package unipotsdam.gf.interfaces;
-
-import java.util.ArrayList;
-
-/**
- * Interface for Project Description
- */
-public interface IProjectDescription {
-
-    /**
-     * Save description to database
-     * @param description
-     */
-    void saveDescription(String description);
-
-    /**
-     * Add a new link to ProjectDescription
-     * @param link url of the link
-     * @param name name to shoe on website
-     */
-    void addLink(String link, String name);
-
-    /**
-     * Delete link
-     * @param name name of the link
-     */
-    void deleteLink(String name);
-
-    /**
-     * Get name of the project
-     * @param projectId Id of the project
-     * @return name of the project
-     */
-
-    String getName(long projectId);
-
-    /**
-     * Get Description of the project
-     * @param projectId Id of the project
-     * @return Desription of the project
-     */
-    String getDescription(long projectId);
-
-    /**
-     * Get Lecturer of the project
-     * @param projectId Id of the project
-     * @return Lecturer of the project
-     */
-    long getLecturer(long projectId);
-
-    /**
-     * Get all Students of the project (Group)
-     * @param projectId Id of the Project
-     * @return Students of the project
-     */
-    ArrayList<Long> getStudents(long projectId);
-
-    /**
-     * Get all Links of the project
-     * @param projectId Id of the Project
-     * @return all links of the project
-     */
-    ArrayList<Long> getLinks(long projectId);
-
-
-
-}