Add syntax highlighting to Python code blocks (#43)

README.md

@@ -56,7 +56,7 @@ quantum programs with a simplified syntax and run the programs on the service. I
 model programming paradigm that is also used in the Amazon Braket SDK.
 
 First, import the following modules and functions:
-```
+```python
 import autoqasm as aq
 from autoqasm.instructions import h, cnot, measure
 ```
@@ -66,7 +66,7 @@ This allows AutoQASM to hook into the program definition and generate an output
 by quantum devices.
 
 For instance, we can create a Bell state like so:
-```
+```python
 # A program that generates a maximally entangled state
 @aq.main
 def bell_state():
@@ -79,7 +79,7 @@ You can view the output format, which is OpenQASM, by running `bell_state.build(
 AutoQASM enables users to use more complicated program constructs with a compact and readable
 structure. We can demonstrate this with a program that conditionally prepares multiple Bell states
 on qubit pairs (1, 2) and (3, 4).
-```
+```python
 @aq.main(num_qubits=5)
 def conditional_multi_bell_states() -> None:
     h(0)
@@ -99,7 +99,7 @@ them out!
 AutoQASM includes a simulator which can be accessed using the Amazon Braket local simulator interface.
 Let's simulate the `conditional_multi_bell_states` program:
 
-```
+```python
 from braket.devices import LocalSimulator
 
 device = LocalSimulator("autoqasm")