Updating Readme for Program 1
Added Program 1 starter code
Batch 4

Removed Calculator.m from CalculatorTests's compile sources
Batch 1
Created numberOnScreen property and -pressKey: method
Batch 2
Declared numberAccumulated and operationPending properties
Batch 3
Synthesized properties, implemented -pressKey:, fixed implementation of -description
Batch 5
Commented out CLItest() line
Batch 6
Implemented digit-adding behavior for -pressKey:
Batch 7
Uncommented CLItest() line
Phase 1

Wrote two failing tests: PressingBigCClearsScreen and PressingLittlecClearsScreen
Phase 2

Added logic to distinguish between digits, clear screen key, and  anything else
Phase 3a

Character identification function
Phase 3b

Clearscreen identification function
Phase 3c

Extracting -appendDigit: method
Phase 3d

Extracting clearScreen method
Phase 4

Initializing properties
Merge commit '3d5de1b67e81e0df520681163879947ebd213535' into Prog1_branch

Conflicts:
	README.md