install/upgrade: added page 5.8.x-to-6.0.0.md

docs/install/upgrade/5.8.x-to-6.0.0.md

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+# Upgrade Kamailio from v5.8.x to v6.0.0 (devel)
+
+The page contains the details about the changes that were made to old
+components during the development of v6.0.0 compared with what existed
+in v5.8.x. It does not include the brand new modules, focusing on how to
+upgrade database and configuration file from v5.8.x to run with Kamailio
+6.0.0.
+
+## Previous Stable Release
+
+If you look for the guidelines to upgrade to previous stable release,
+see:
+
+- [Upgrade Kamailio v5.7.x to v5.8.0](5.7.x-to-5.8.0.md)
+
+## Remarks
+
+Following tokens are used to mark the changes:
+
+- INF - the change doesn't really have any direct impact - no action
+    required in old config
+- CPM - the change was used with the new value via explicit parameter
+    in default config file from old releases
+- RCM - the change is recommended to be done if you had an explicit
+    different or lower value for this parameter in old config
+- UPG - the change has to be done, older config does not work any
+    longer
+
+## Modules
+
+### Upgraded Modules
+
+- none
+
+### Removed Modules
+
+- none
+
+### Renamed Modules
+
+- none
+
+## Internal Libraries
+
+## Core
+
+### Parameters
+
+### Misc
+
+## Database
+
+### MySQL Database Structure
+
+Run following SQL statements in MySQL client to upgrade database
+structure from v5.8 to v6.0:
+
+``` sql
+...
+```