Improve README.md formatting

The markdown formatting in the README.md file has been modified to ensure better readability. This mainly includes correcting the indentation in the code blocks under the "Installation" section.

README.md

@@ -21,23 +21,26 @@ A PHP extension that provides Aspect-Oriented Programming (AOP) functionality fo
 ## Installation
 
 1. Clone the repository:
-   ```
+
+```
 git clone https://github.com/ray-di/ext-rayaop.git
 cd ext-rayaop
-   ```
+```
 
 2. Build and install the extension:
-   ```
+
+```
 phpize
 ./configure
 make
 make install
-   ```
+```
 
 3. Add the following line to your php.ini file:
-   ```
+
+```
 extension=rayaop.so
-   ```
+```
 
 ## About this Extension
 
@@ -164,5 +167,4 @@ make test TESTS="-v tests/your_specific_test.phpt"
 ```
 
 Replace `your_specific_test.phpt` with the actual test file you want to run.
-```