feat(core): When changing ticket description create an action comment with the details

ref: #502

app/core/models/ticket/ticket.py

@@ -1,3 +1,5 @@
+import difflib
+
 from django.contrib.auth.models import User
 from django.db import models
 from django.db.models import Q, signals, Sum
@@ -953,6 +955,24 @@ class Ticket(
                 comment_field_value = f"changed Real Finish Date from _{before[field]}_ to **{to_value}**"
 
 
+            if field == 'description':
+
+                comment_field_value = ''.join(
+                    str(x) for x in list(
+                        difflib.unified_diff(
+                            str(before[field] + '\n').splitlines(keepends=True),
+                            str(after[field] + '\n').splitlines(keepends=True),
+                            fromfile = 'before',
+                            tofile = 'after',
+                            n = 10000,
+                            lineterm = '\n'
+                        )
+                    )
+                ) + ''
+
+                comment_field_value = '<details><summary>Changed the Description</summary>\n\n``` diff \n\n' + comment_field_value + '\n\n```\n\n</details>'
+
+
             if comment_field_value:
 
                 if request: