Update README with project/sprint CRUD documentation

scripts/README.md

@@ -69,6 +69,18 @@ A unified CLI that covers all API operations.
 ```bash
 # List all projects
 ./scripts/gantt.sh project list
+
+# Create project
+./scripts/gantt.sh project create "Project Name" "Description" "#color"
+
+# Update project field
+./scripts/gantt.sh project update <project-id> <field> <value>
+./scripts/gantt.sh project update abc-123 name "New Name"
+./scripts/gantt.sh project update abc-123 description "New desc"
+./scripts/gantt.sh project update abc-123 color "#ff0000"
+
+# Delete project
+./scripts/gantt.sh project delete <project-id>
 ```
 
 ### Sprint Commands
@@ -76,6 +88,18 @@ A unified CLI that covers all API operations.
 ```bash
 # List all sprints
 ./scripts/gantt.sh sprint list
+
+# Create sprint
+./scripts/gantt.sh sprint create "Sprint 2" <project-id> "2026-02-23" "2026-03-01" "Sprint goal"
+
+# Update sprint field
+./scripts/gantt.sh sprint update <sprint-id> <field> <value>
+./scripts/gantt.sh sprint update abc-123 name "New Sprint Name"
+./scripts/gantt.sh sprint update abc-123 status active
+./scripts/gantt.sh sprint update abc-123 startDate "2026-02-25"
+
+# Delete sprint
+./scripts/gantt.sh sprint delete <sprint-id>
 ```
 
 ### Auth Commands
@@ -144,7 +168,13 @@ Displays text files in terminal, saves binary files to `/tmp/`.
 | Add comment | ✅ | ✅ | ❌ |
 | Attach file | ✅ | ✅ | ✅ |
 | List projects | ✅ | ✅ | ❌ |
+| Create project | ✅ | ✅ | ❌ |
+| Update project | ✅ | ✅ | ❌ |
+| Delete project | ✅ | ✅ | ❌ |
 | List sprints | ✅ | ✅ | ❌ |
+| Create sprint | ✅ | ✅ | ❌ |
+| Update sprint | ✅ | ✅ | ❌ |
+| Delete sprint | ✅ | ✅ | ❌ |
 | Auth login | ✅ | ✅ | ❌ |
 | Auth logout | ✅ | ✅ | ❌ |
 | Auth register | ✅ | ✅ | ❌ |