Add LTI doc

LTI/LTI.md

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+# Learning Tools Interoperability (LTI)
+
+## LTI
+
+Read more about IMS Global defined interface for tools like our VideoConference system integration with Learning Managment Systems(LMS) (e.g. moodle).
+See: [IMS Global Learning Tool Interoperability](https://www.imsglobal.org/activity/learning-tools-interoperability)
+
+We implemented LTI interface version 1.0/1.1
+
+### Server config auth section LTI settings
+
+Set in server configuration a random key and secret
+
+``` json
+auth :
+    {
+        lti :
+        {
+            consumerKey    : 'key',
+            consumerSecret : 'secret'
+        },
+    }
+```
+
+### Configure your LMS system with secret and key settings above
+
+#### Auth tool URL
+
+Set tool URL to your server with path /auth/lti
+
+``` url
+https://mm.example.com/auth/lti
+```
+
+#### In moodle find external tool plugin setting and external tool action
+
+See: [moodle external tool settings](https://docs.moodle.org/38/en/External_tool_settings)
+
+#### Add and activity
+
+![Add external tool](lti1.png)
+
+#### Setup Activity
+
+##### Activity setup basic form
+
+Open fully the settings **Click on show more!!**
+![Add external tool config](lti2.png)
+
+##### Empty full form
+
+![Opened external tool config](lti3.png)
+
+##### Filled out form
+
+![Filled out external tool config](lti4.png)
+
+## moodle plugin
+
+Alternativly you can use multipartymeeting moodle plugin:
+[https://github.com/misi/moodle-mod_multipartymeeting](https://github.com/misi/moodle-mod_multipartymeeting)