Merge pull request #24 from christianguenter2/user-exit

add user exit

Author: oblomov-dev

docs/advanced/extensibility/user_exits.md

@@ -0,0 +1,5 @@
+abap2UI5 contains predefined predefined user exits which can be used to modify the standard behaviour. The user exits are exposed by the interface `Z2UI5_IF_EXIT`. To use them in your system you have to create a new class which implements the interface and its methods. They're called dynamically by abap2UI5 class `Z2UI5_CL_EXIT`. You should **not** include your class into abap2UI5 packages but in any other custom package.
+
+These are the available methods:
+- `GET_DRAFT_EXP_TIME_IN_HOURS`: You can override the default 4 hour abap2UI5 draft session timeout
+- `ADJUST_CONFIG`: You can change abap2UI5 startup parameters like theme or UI5 version