Add documentation to the guards module.

src/app/_guards/auth.guard.spec.ts

@@ -1,5 +1,7 @@
+// Core imports
 import { TestBed } from '@angular/core/testing';
 
+// Application imports
 import { AuthGuard } from '@app/_guards/auth.guard';
 
 describe('AuthGuard', () => {

src/app/_guards/auth.guard.ts

@@ -1,14 +1,37 @@
+// Core imports
 import { Injectable } from '@angular/core';
-import {CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router} from '@angular/router';
+import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree} from '@angular/router';
+
+// Third party imports
 import { Observable } from 'rxjs';
 
+/**
+ * Auth guard implementation.
+ * Dictates access to routes depending on the authentication status.
+ *
+ * @implements CanActivate
+ */
 @Injectable({
   providedIn: 'root'
 })
 export class AuthGuard implements CanActivate {
 
+  /**
+   * Instantiates the auth guard class.
+   *
+   * @param router - A service that provides navigation among views and URL manipulation capabilities.
+   */
   constructor(private router: Router) {}
 
+  /**
+   * Returns whether navigation to a specific route is acceptable.
+   * Checks if the user has uploaded a private key.
+   *
+   * @param route - Contains the information about a route associated with a component loaded in an outlet at a particular moment in time.
+   * ActivatedRouteSnapshot can also be used to traverse the router state tree.
+   * @param state - Represents the state of the router at a moment in time.
+   * @returns true - If there is an active private key in the user's localStorage.
+   */
   canActivate(
     route: ActivatedRouteSnapshot,
     state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {

src/app/_guards/role.guard.spec.ts

@@ -1,5 +1,7 @@
+// Core imports
 import { TestBed } from '@angular/core/testing';
 
+// Application imports
 import { RoleGuard } from '@app/_guards/role.guard';
 
 describe('RoleGuard', () => {

src/app/_guards/role.guard.ts

@@ -1,14 +1,37 @@
+// Core imports
 import { Injectable } from '@angular/core';
-import {CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router} from '@angular/router';
+import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree} from '@angular/router';
+
+// Third party imports
 import { Observable } from 'rxjs';
 
+/**
+ * Role guard implementation.
+ * Dictates access to routes depending on the user's role.
+ *
+ * @implements CanActivate
+ */
 @Injectable({
   providedIn: 'root'
 })
 export class RoleGuard implements CanActivate {
 
+  /**
+   * Instantiates the role guard class.
+   *
+   * @param router - A service that provides navigation among views and URL manipulation capabilities.
+   */
   constructor(private router: Router) {}
 
+  /**
+   * Returns whether navigation to a specific route is acceptable.
+   * Checks if the user has the required role to access the route.
+   *
+   * @param route - Contains the information about a route associated with a component loaded in an outlet at a particular moment in time.
+   * ActivatedRouteSnapshot can also be used to traverse the router state tree.
+   * @param state - Represents the state of the router at a moment in time.
+   * @returns true - If the user's role matches with accepted roles.
+   */
   canActivate(
     route: ActivatedRouteSnapshot,
     state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {