added developer file

DEVELOPER.md

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+# aws-unified-firehose
+Forwards logs from cloudwatch to NewRelic through Amazon Data Firehose
+
+## Requirements
+
+- SAM CLI - [Install the SAM CLI](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html)
+
+## Deployment
+
+To try this integration out you can use the `sam` cli to deploy the cloudformation template (`firehose-template.yml`). Make sure **aws is properly authenticated with an account of your choice**.
+
+## Building and packaging
+To build and package, follow these steps:
+1. Authenticate with your aws account details
+2. Create an S3 bucket with a unique name, e.g., `test123`.
+3. Build the project:
+    ```sh
+    sam build --template-file firehose-template.yaml
+    ```
+4. The build will be located by default at `.aws-sam/build`, and a template file will be created with the name `template.yaml`.
+5. Package the project:
+    ```sh
+    sam package --s3-bucket test123 --template-file .aws-sam/build/template.yaml --output-template-file firehose-template.yaml --region us-east-2
+    ```
+6. Copy the main template file to the S3 bucket:
+    ```sh
+    aws s3 cp .aws-sam/build/firehose-template.yaml s3://test123/firehose-template.yaml
+    ```