feat: Add `create_issue_advanced` MCP tool and initial README documentation for…

feat: Add `create_issue_advanced` MCP tool and initial README documentation for the Jira MCP server.

jira_mcp_server.py

@@ -132,6 +132,64 @@ def create_issue(summary: str, description: str, project_key: str = None, issue_
     except Exception as e:
         return f"Error creating issue: {str(e)}"
 
+@mcp.tool()
+def create_issue_advanced(
+    summary: str,
+    description: str,
+    issue_type: str = "Bug",
+    project_key: str = None,
+    priority: str = None,
+    assignee: str = None,
+    components: List[str] = None,
+    labels: List[str] = None,
+    environment: str = None,
+    due_date: str = None,
+    original_estimate: str = None
+) -> str:
+    """Creates a Jira issue with advanced fields matched to the web interface.
+    Use this when you need to specify assignee, labels, components, or estimations.
+    """
+    global ACTIVE_PROJECT
+    jira = _get_jira()
+    
+    target_project = project_key or ACTIVE_PROJECT
+    if not target_project:
+        return "Error: No project_key provided and no active project is set."
+        
+    try:
+        issue_dict = {
+            'project': {'key': target_project},
+            'summary': summary,
+            'description': description,
+            'issuetype': {'name': issue_type},
+        }
+        
+        if priority:
+            issue_dict['priority'] = {'name': priority}
+            
+        if assignee and assignee.lower() != 'automatic':
+            issue_dict['assignee'] = {'name': assignee}
+            
+        if components:
+            issue_dict['components'] = [{'name': c} for c in components]
+            
+        if labels:
+            issue_dict['labels'] = labels
+            
+        if environment:
+            issue_dict['environment'] = environment
+            
+        if due_date: # Format: YYYY-MM-DD
+            issue_dict['duedate'] = due_date
+            
+        if original_estimate: # Format: e.g. '3w 4d 12h'
+            issue_dict['timetracking'] = {'originalEstimate': original_estimate}
+            
+        new_issue = jira.create_issue(fields=issue_dict)
+        return f"Successfully created {issue_type} {new_issue.key}. URL: {JIRA_SERVER}/browse/{new_issue.key}"
+    except Exception as e:
+        return f"Error creating advanced issue: {str(e)}"
+
 @mcp.tool()
 def create_issue_with_subtasks(summary: str, description: str, subtasks: List[str], project_key: str = None, parent_issue_type: str = "Story") -> str:
     """Creates a new Jira Issue (Story or Task) along with a list of Sub-tasks. If project_key is not provided, uses the active project."""