Update README

Author: shenuramendis

README.md

@@ -6,13 +6,23 @@ The expression is converted using a shunting-yard algorithm and is then evaluate
 
 ## Operations
 
-The program currently supports five operations, which can be found in [operations.py](rpn_calc/operations.py)
+The program currently supports the following operations and functions, which can be found in [operations.py](rpn_calc/operations.py)
 1. Addition (+)
 2. Subtraction (-)
 3. Multiplication (*)
 4. Division (/)
 5. Exponentiation (^)
+6. Unary minus (~)
+7. Factorials and/or Gamma (!)
+8. sine
+9. cosine
+10. tangent
+
+The calculator is also able to detect instances of implicit multiplication.
 
 ## Running the program
 
-To run the program, download the [rpn_calc](rpn_calc/) folder, and run [calculator.py](rpn_calc/calculator.py) in the terminal.
+To run the program, download [run.py](run.py), [exp.txt](exp.txt), and the [rpn_calc](rpn_calc/) folder. 
+Edit [exp.txt](exp.txt) to contain your expressions as instructed. 
+Run [run.py](test.py) in the terminal.
+An output file called "equals.txt" should be created in the same folder as your run.py.