Update README file with SDK installation instruction

README.md

@@ -15,6 +15,39 @@ Docs related to this repository are located at:
 4. GatewayResponse Error / Decline Codes: https://help.rocketgate.com/support/solutions/articles/28000018169-gatewayresponse-error-decline-codes
 
 
+## Installation Steps
+
+### 1. Create the RocketGate Package
+At the root of your project, create a directory named `RocketGate`. This will serve as the Python package for the RocketGate SDK.
+
+### 2. Add the SDK File
+Copy the `RocketGate.py` file into the newly created `RocketGate` directory.
+
+### 3. Initialize the Package
+In the `RocketGate` directory, create a file named `__init__.py` with the following content:
+```python
+from .RocketGate import *
+```
+
+### 4. Import and Use the SDK
+Now, you can import the RocketGate package in your Python files and use the SDK as follows:
+```python
+from RocketGate import *
+
+# Sample Usage:
+
+# Create instances of request, response, and service
+request = GatewayRequest()
+response = GatewayResponse()
+service = GatewayService()
+
+# Set the required merchant credentials
+request.Set(GatewayRequest.MERCHANT_ID, 1)
+request.Set(GatewayRequest.MERCHANT_PASSWORD, "testpassword")
+
+# Add more implementation as needed
+```
+
 ## Running integration tests
 From the root of the project, using your installed Python Interpreter, run the following command:
 ```shell