Added CLI arguments

Author: f-aguzzi

README.md

@@ -1,2 +1,34 @@
 # af6502
 6502 8-bit processor emulator
+
+This emulator is still a work in progress. Most of the instruction set is
+still unimplemented.
+
+## Usage
+
+The emulator shall be operated from the command line.
+
+The command line flags must have space between each other, but their
+arguments are attached. For example, to load a file and activate the
+register status output:
+
+```
+af6502 -input=./program.bin -showstatus
+```
+
+### Command line arguments:
+
+- `cycles=` *(followed by a number, without quotes)*: sets the number of
+  clock cycles to execute
+- `-input=` *(followed by the path, without quotes)*: selects the input
+  binary file
+- `-showstatus`: displays the status of the registers in the terminal,
+  at the end of the execution
+- `-dump=` *(followed by the path, without quotes)*: selects the path for
+  the memory dump file
+- `start=` *(followed by a number, without quotes)*: sets the inital value
+  for the Program Counter register, that is, the starting memory location
+  of the executable. When loading a binary, it will be transcribed to
+  memory starting from this value
+
+Invalid flags are ignored.

compile_flags.txt

@@ -1,2 +1,2 @@
 -std=c++20
--stdlib=libc++
+