feat: Update README (#2)

packages/noodl-cloudservice-docker/README.md

@@ -14,3 +14,47 @@ This package contains the docker image of the Noodl Self Hosted Cloud Service.
 # Accumulating all health check procedures in the application.
 /health
 ```
+
+## Environment variables
+
+### `PORT`
+
+**Description**: The **`PORT`** variable defines the port number on which the application will run. It is the entry point for incoming network traffic.
+
+**Default Value: `3000`**
+
+### `DATABASE_URI`
+
+**Description**: The **`DATABASE_URI`** variable specifies the Uniform Resource Identifier (URI) for connecting to the database. It includes information such as the database type, host, port, username, password, and database name.
+
+**Example: `mongodb://username:password@localhost:27017/mydatabase`**
+
+### `MASTER_KEY`
+
+**Description**: The **MASTER_KEY** is a security credential that grants unrestricted access to the application's resources. It is a sensitive piece of information and should be kept confidential.
+
+**Security Note**: Keep the **MASTER_KEY** secure and do not expose it publicly.
+
+### `APP_ID`
+
+**Description**: The **`APP_ID`** variable uniquely identifies the application within the system. It is used for authentication and authorization purposes.
+
+**Example: `myApp123`**
+
+### `CLOUD_FUNCTIONS_TIMEOUT`
+
+**Description**: The **`CLOUD_FUNCTIONS_TIMEOUT`** variable sets the maximum time (in seconds) allowed for the execution of cloud functions. If a function exceeds this time limit, it may be terminated.
+
+**Default Value: `15`** in seconds
+
+### `CLOUD_FUNCTIONS_MEMORY_LIMIT`
+
+**Description**: The **`CLOUD_FUNCTIONS_MEMORY_LIMIT`** variable determines the maximum amount of memory (in megabytes) that a cloud function is allowed to consume during execution.
+
+**Default Value: `256`** in MB
+
+### `MAX_UPLOAD_SIZE`
+
+**Description**: The **`MAX_UPLOAD_SIZE`** variable specifies the maximum allowed size for file uploads in the application.
+
+**Default Value: `20mb`**