[ADD] Unsplash: Documentation to retrieve access key & app id

general/unsplash.rst

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+========
+Unsplash
+========
+
+.. toctree::
+   :titlesonly:
+
+   unsplash/unsplash_access_key
+   unsplash/unsplash_application_id

general/unsplash/unsplash_access_key.rst

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+=======================================================
+How to generate an Unsplash access key
+=======================================================
+
+- Create an account on `Unsplash.com <https://unsplash.com/join>`_.
+
+- Go to your `applications dashboard <https://unsplash.com/oauth/applications>`_ and click on **New Application**.
+
+.. image:: media/create_app.png
+    :align: center
+
+- Accept the conditions and click on **Accept terms**.
+
+.. image:: media/accept_terms.png
+    :align: center
+
+- You will be prompted to insert an **Application name** and a **Description**. Once done, click on **Create application**.
+
+.. image:: media/app_infos.png
+    :align: center
+
+- You should be redirected to your application details page. Scroll down a bit to find your **access key**.
+
+.. image:: media/access_key.png
+    :align: center
+

general/unsplash/unsplash_application_id.rst

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+=======================================================
+How to generate an Unsplash application ID
+=======================================================
+
+- You should first create and set up your Unsplash application with this tutorial: `How to generate an Unsplash access key <https://www.odoo.com/documentation/user/unsplash_access_key.html>`_.
+
+- Go to your `applications dashboard <https://unsplash.com/oauth/applications>`_ and click on your newly created Unsplash application under **Your applications**.
+
+.. image:: media/select_app.png
+    :align: center
+
+- You will be redirected to your application details page. The **application ID** will be visible in your browser's URL. The URL should be something like ``https://unsplash.com/oauth/applications/application_id``
+
+.. image:: media/app_id_url.png
+    :align: center
+
+- Note that if you `apply for a production account <https://unsplash.com/documentation#registering-your-application>`_ and it got approved, your will also find your application ID in the UI. It will be listed next to your **Access Key** on your application details page.
+
+.. image:: media/production_account.png
+    :align: center