Add release notes for 5.8.1

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+# CiviCRM 5.8.1
+
+Released December 12, 2018
+
+- **[Synopsis](#synopsis)**
+- **[Bugs resolved](#bugs)**
+- **[Credits](#credits)**
+- **[Feedback](#feedback)**
+
+## <a name="synopsis"></a>Synopsis
+
+| *Does this version...?*                                         |         |
+|:--------------------------------------------------------------- |:-------:|
+| Fix security vulnerabilities?                                   |   no    |
+| Change the database schema?                                     |   no    |
+| Alter the API?                                                  |   no    |
+| Require attention to configuration options?                     |   no    |
+| Fix problems installing or upgrading to a previous version?     |   no    |
+| Introduce features?                                             |   no    |
+| **Fix bugs?**                                                   | **yes** |
+
+## <a name="bugs"></a>Bugs resolved
+
+- **[dev/core#582](https://lab.civicrm.org/dev/core/issues/582)
+  Fix regression in which search builder UI does not display datepicker icon
+  (Backport [13249](https://github.com/civicrm/civicrm-core/pull/13249))**
+
+- **[dev/core#589](https://lab.civicrm.org/dev/core/issues/589)
+  Fix regression in which settings for the autocomplete-search are not saved
+  (Backport [13256](https://github.com/civicrm/civicrm-core/pull/13256))**
+
+- **[dev/core#588](https://lab.civicrm.org/dev/core/issues/588)
+  Fix regression in which CiviMail tests display a double-prefix
+  (Backport [13265](https://github.com/civicrm/civicrm-core/pull/13265))**
+
+  NOTE: Users of Mosaico/Flexmailer should upgrade to Flexmailer `v1.0-beta1+`
+  for a complete fix ([#28](https://github.com/civicrm/org.civicrm.flexmailer/pull/28)).
+
+## <a name="credits"></a>Credits
+
+This release was developed by the following authors and reviewers:
+
+Wikimedia Foundation - Eileen McNaughton; Megaphone Technology Consulting -
+Jon Goldberg; Fuzion - Luke Stewart; CiviCRM - Tim Otten, Coleman Watts;
+Australian Greens - Seamus Lee
+
+## <a name="feedback"></a>Feedback
+
+These release notes are edited by Tim Otten and Andrew Hunt.  If you'd like to
+provide feedback on them, please login to https://chat.civicrm.org/civicrm and
+contact `@agh1`.