Added documentation for the project api part

docs/api/projects.md

 ## Projects
+
+### GET `/project` [requires authentication]
+
+Get all the projects currently visible to the authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    projects: {
+        id: string;
+        name: string;
+        text: string;
+        color: string;
+        status: string;
+        deadline?: string;
+    }[];
+}
+```
+
+### GET `/project/:uuid` [requires authentication]
+
+Get the project with the given id, if it is visible to the currently authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    project: {
+        id: string;
+        name: string;
+        text: string;
+        color: string;
+        status: string;
+        deadline?: string;
+        teams: string[];
+    };
+}
+```
+
+### GET `/project/:uuid/tasks` [requires authentication]
+
+Get all tasks that belong to the project with the given id, if it is visible to the currently
+authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    tasks: {
+        id: string;
+        project: string;
+        name: string;
+        text: string;
+        icon: string;
+        priority: string;
+        status: string;
+        dependencies: string[];
+        requirements: {
+            role: string;
+            time: number;
+        }[];
+        assigned: {
+            user: string;
+            time: number;
+            finished: boolean;
+        }[];
+        created: number;
+        edited: number;
+        color: string;
+    }[];
+}
+```
+
+### GET `/project/:uuid/assigned` [requires authentication]
+
+Get all users that are assigned to one of the tasks belonging to the project with the given id, if
+it is visible to the currently authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    assigned: {
+        id: string;
+        username: string;
+        email: string;
+        realname: string;
+        time: number;
+    }[];
+}
+```
+
+### GET `/project/:uuid/work?since=X&to=X` [requires authentication]
+
+Get all work items for tasks belonging to the project with the given id, if it is visible to the
+currently authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    work: {
+        id: string,
+        task: string,
+        user: string,
+        started: number,
+        finished: number,
+    }[];
+}
+```
+
+### GET `/user/activity?since=X&to=X` [requires authentication]
+
+Get the activity for tasks belonging to the project with the given id, if it is visible to the
+currently authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    activity: {
+        day: string;
+        time: number;
+    }[];
+}
+```
+
+### GET `/user/completion?since=X&to=X` [requires authentication]
+
+Get the completion of tasks belonging to the project with the given id, if it is visible to the
+currently authenticated user.
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    completion: {
+        open: number;
+        closed: number;
+        suspended: number;
+        overdue: number;
+    };
+}
+```
+
+### POST `team` [requires authentication]
+
+Create a new project with the given data. On successful creation the id of the new projects id will
+be returned.
+
+#### Request body
+
+```typescript
+interface Body {
+    teams: Array<string>;
+    name: string;
+    text: string;
+    color: string;
+    deadline?: string;
+}
+```
+
+#### Response body
+
+```typescript
+interface Body {
+    status: string;
+    id: string;
+}
+```
+
+### PUT `team/:uuid` [requires authentication]
+
+Update the project with the given id.
+
+#### Request body
+
+```typescript
+interface Body {
+    remove_teams?: Array<string>;
+    add_teams?: Array<string>;
+    name?: string;
+    text?: string;
+    color?: string;
+    status?: string;
+    deadline?: string;
+}
+```
+