Feature Request: Add `addp` command for adding tasks with priority

[rosconap]

You can set a priority default in the configuration file. I would like it to be easily added when creating a new task.

Current steps to add a priority to a task.

Adding a prioritized task currently requires two steps:

1. todo.sh add "task"
2. todo.sh pri TASK_NUMBER PRIORITY

This interrupts the quick task capture workflow that todo.txt promotes.

Proposed Solution

Add an addp command: todo.sh addp PRIORITY "TASK"

Examples:

todo.sh addp A "Important meeting"     # Creates: (A) Important meeting
todo.sh addp C "Learn to juggle sharp objects"          # Creates: (C) Learn to juggle sharp objects

[rosconap]

I also created a PR for this feature: #471

[pboedker]

I have been using the following method with great success when adding tasks:

todo.sh add "(A) Important meeting"     # Creates: (A) Important meeting
todo.sh add "(C) Learn to juggle sharp objects"          # Creates: (C) Learn to juggle sharp objects