Create logging.md

Author: oblomov-dev

docs/addons/logging.md

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+# Logging
+
+## Use Cases
+
+### 1. UI for abap-logger
+
+UI for the Open Source Project [**abap-logger**](https://github.com/ABAP-Logger/ABAP-Logger)
+
+```abap
+CLASS z2ui5add_cl_abap_logger_sample DEFINITION PUBLIC FINAL
+  CREATE PUBLIC .
+
+  PUBLIC SECTION.
+    INTERFACES z2ui5_if_app.
+
+ENDCLASS.
+
+CLASS z2ui5add_cl_abap_logger_sample IMPLEMENTATION.
+
+  METHOD z2ui5_if_app~main.
+
+    DATA: log TYPE REF TO zif_logger.
+    log = zcl_logger_factory=>create_log( object = 'ZINTERFACES'
+                                          subobject = 'ACCOUNTING'
+                                          desc = 'Stuff imported from legacy systems' ).
+
+    log->e( 'You see, what had happened was...' ).
+
+    client->nav_app_call( z2ui5add_cl_abap_logger_ui=>display_popup( log ) ).
+
+  ENDMETHOD.
+
+ENDCLASS.
+```
+
+### 2. POPUP for BAL Messages
+
+```abap
+CLASS z2ui5add_cl_abap_logger_sample DEFINITION PUBLIC FINAL
+  CREATE PUBLIC .
+
+  PUBLIC SECTION.
+    INTERFACES z2ui5_if_app.
+
+ENDCLASS.
+
+CLASS z2ui5add_cl_abap_logger_sample IMPLEMENTATION.
+
+  METHOD z2ui5_if_app~main.
+
+    DATA: log TYPE REF TO zif_logger.
+    log = zcl_logger_factory=>create_log( object = 'ZINTERFACES'
+                                          subobject = 'ACCOUNTING'
+                                          desc = 'Stuff imported from legacy systems' ).
+
+    log->e( 'You see, what had happened was...' ).
+
+    client->nav_app_call( z2ui5add_cl_abap_logger_ui=>display_popup( log ) ).
+
+  ENDMETHOD.
+
+ENDCLASS.
+```
+
+<br>
+<img width="800" alt="SAPGUI 2024-09-05 08 00 51" src="https://github.com/user-attachments/assets/02c6a23a-e4cc-4439-afa0-7842897c8468">