Feat: Added automatic determination of task number based on complexity (#884)

- Added 'defaultNumTasks: 10' to default config, now used in 'parse-prd'
- Adjusted 'parse-prd' and 'expand-task' to:
  - Accept a 'numTasks' value of 0
  - Updated tool and command descriptions
  - Updated prompts to 'an appropriate number of' when value is 0
- Updated 'README-task-master.md' and 'command-reference.md' docs
- Added more tests for: 'parse-prd', 'expand-task' and 'config-manager'

Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

scripts/modules/config-manager.js

@@ -61,6 +61,7 @@ const DEFAULTS = {
 	global: {
 		logLevel: 'info',
 		debug: false,
+		defaultNumTasks: 10,
 		defaultSubtasks: 5,
 		defaultPriority: 'medium',
 		projectName: 'Task Master',