Added more options

README.md

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+An LTI-compatible launching plugin for Wordpress, updated to work with https://www.cengage.uk/
+
+General Wordpress plugin installation instructions can be found here: http://codex.wordpress.org/Managing_Plugins#Automatic_Plugin_Installation
+
+### Using shortcodes:
+
+After installing the plugin, add content launching with the [lti-launch]
+shortcode.
+
+
+Some examples:
+
+    [lti-launch consumer_key=yourconsumerkey secret_key=yoursecretkey display=iframe configuration_url=http://launcher.saltbox.com/lms/configuration resource_link_id=testcourseplacement1]
+
+    [lti-launch consumer_key=yourconsumerkey secret_key=yoursecretkey display=newwindow action=link configuration_url=http://launcher.saltbox.com/lms/configuration resource_link_id=testcourseplacement1]
+
+    [lti-launch consumer_key=yourconsumerkey secret_key=yoursecretkey display=self action=button launch_url=http://launcher.saltbox.com/launch resource_link_id=testcourseplacement1]
+
+
+Options:
+
+- display
+
+  - newwindow: launches into a new window
+
+  - self: launches into the same window, replacing the current content
+
+  - iframe: launches into an iframe embedded in the content
+
+- action
+
+  - button: shows a button to the user, which they click on to launch
+
+  - link: shows a link to the user, which they click on to launch
+
+- configuration_url: the URL to the launch XML configuration
+
+- launch_url: The launch URL of the LTI-compatible tool
+
+
+Caution!  Since shortcodes are visible to content viewers if their plugin is
+disabled, OAuth secret keys will become visible if this plugin is disabled.
+
+### Using TLI Content - Launch Settings:
+
+After installing this plugin, you will notice a new "LTI content" menu item in the WP Admin dashboard. Here you will be able to create a custom post, witch in the end generates a shortcode that can be used on any page.
+
+TLI Launch setting example::
+![Screenshot](/LTI-Launch-settings.jpg)
+
+Copyright (c) 2021 Saltbox Services.
+Licensed under the GPLv3. See the LICENSE.md file for details.
+

lti-consumer-form.php

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+<?php
+
+namespace Saltbox;
+?>
+<h1>LTI Content Options</h1>
+
+<form method="POST">
+
+    <table class="form-table" role="presentation">
+        <tbody>
+            <tr>
+                <th scope="row"><label for="lti_instructor_user_role">Instructor user role's</label></th>
+                <td>
+                    <select id="lti_instructor_user_role" name="lti_instructor_user_role[]" multiple  style="height: 200px;">
+                        <option value="-1"></option>
+                        <?php
+                        foreach ($editable_roles as $role => $details) {
+                            echo '<option value="' . esc_attr($role) . '" ' . (in_array(esc_attr($role), $instructor_role) ? 'selected' : '') . ' >' . translate_user_role($details['name']) . '</option >';
+                        }
+                        ?>
+                    </select>
+                </td>
+            </tr>            
+        </tbody>
+    </table>
+
+    <?php wp_nonce_field('sb_lti_options_page_action', '_wpnonce_sb_lti_options_page_action'); ?>
+    <p class="submit">
+        <input type="submit" value="Save" class="button button-primary button-large">
+    </p>
+</form>