Add release notes for 4.7.22

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+# CiviCRM 4.7.22
+
+Released July 12, 2017
+
+- **[Bugs resolved](#bugs)**
+
+## <a name="bugs"></a>Bugs resolved
+
+### Core CiviCRM
+
+- **[CRM-20561](https://issues.civicrm.org/jira/browse/CRM-20561) Load Net_SMTP, Auth_SASL, Net_Socket via Composer
+  ([10622](https://github.com/civicrm/civicrm-core/pull/10622))**
+
+  This resolves an SMTP authentication issue by updating a patch for
+  compatibility with the a newer release of `Net_SMTP`.
+
+- **[CRM-20829](https://issues.civicrm.org/jira/browse/CRM-20829) Install requirements fail because of port string
+  ([10626](https://github.com/civicrm/civicrm-core/pull/10626))**
+
+  This fixes a bug where new, GUI-based installations failed in Drupal and
+  WordPress if the MySQL credentials relied on the default (implicit) port.
+
+- **[CRM-20600](https://issues.civicrm.org/jira/browse/CRM-20600) Display warning if asset-caching is likely to fail
+  ([10644](https://github.com/civicrm/civicrm-core/pull/10644))**
+
+  This mitigates an issue where pages based on AngularJS do
+  not load because the site has a configuration problem.
+
+- **[CRM-20834](https://issues.civicrm.org/jira/browse/CRM-20834) Drupal user not created via Profile due to missing email field
+  ([10636](https://github.com/civicrm/civicrm-core/pull/10636))**
+
+
+### Backdrop Integration
+
+- **Improve Views checkbox value handling
+  ([37](https://github.com/civicrm/civicrm-backdrop/pull/37))**
+
+- **When creating a new Backdrop user, two corresponding CiviCRM contacts are created.
+  ([22](https://github.com/civicrm/civicrm-backdrop/issues/22))**
+
+- **Access denied on Civi profile forms on user page
+  ([31](https://github.com/civicrm/civicrm-backdrop/issues/31))**
+
+- **CiviCRM-related warning when saving Backdrop permissions page
+  ([23](https://github.com/civicrm/civicrm-backdrop/issues/23))**