chore: added readme

.gitignore

@@ -1,3 +1,4 @@
 .env
 tmp/
-.vscode
+.vscode
+bin

Makefile

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 dev:
 	air
 
+build:
+	go build -o bin/service .
+
 docker.chi.build:
 	docker build -t chi .
 

README.md

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+## README for Backend Service
+
+This repository provides a Go backend service for initiating multipart uploads, generating presigned URLs for part uploads, and completing multipart uploads to Amazon S3.
+
+**Features:**
+
+- Implements a multi-part upload workflow for large files.
+- Provides API endpoints for initiating, pre-signing individual parts, and completing uploads.
+- Uses AWS S3 for storage.
+
+**Requirements:**
+
+- Go 1.17 or later
+- AWS account with S3 bucket
+
+**Installation:**
+
+1. Clone this repository.
+2. Create a `.env` file in the project root directory with the following environment variables:
+   - `AWS_ACCESS_KEY_ID`: The access id with s3 permissions.
+   - `AWS_SECRET_ACCESS_KEY`: The secret access key with s3 permissions.
+   - `AWS_REGION`: The AWS region where your S3 bucket is located.
+   - `AWS_BUCKET`: The name of your S3 bucket.
+   - `PORT`: Server running port
+
+**Running the Service:**
+
+1. Build the service:
+   ```bash
+   make build
+   ```
+2. Run the service:
+   ```bash
+   ./bin/service
+   ```
+
+This will start the service and listen for requests on port 8080.
+
+**API Endpoints:**
+
+- **`/initiate` (GET):** Initiates a multipart upload for a file.
+
+  - Query parameter: `key` (string): The name of the file to upload.
+  - Response: JSON object containing the `uploadId` for the multipart upload.
+
+- **`/presigned` (GET):** Generates a presigned URL for uploading a specific part of a multipart upload.
+
+  - Query parameters:
+    - `key` (string): The name of the file to upload.
+    - `uploadId` (string): The `uploadId` obtained from the `/initiate` endpoint.
+    - `partNumber` (int): The part number of the part to upload.
+  - Response: JSON object containing the `uploadUrl` for the part upload, the `uploadId`, the `partNumber`, and the `expiresAt` timestamp for the presigned URL.
+
+- **`/complete` (POST):** Completes a multipart upload by providing the ETags of all uploaded parts.
+  - Request body: JSON object with a `parts` array containing objects with `PartNumber` (int) and `ETag` (string) keys for each uploaded part.
+  - Query parameters:
+    - `key` (string): The name of the file that was uploaded.
+    - `uploadId` (string): The `uploadId` obtained from the `/initiate` endpoint.
+  - Response: Status code 200 if the upload is completed successfully.
+
+**CORS Configuration:**
+
+The service is configured with CORS (Cross-Origin Resource Sharing) to allow requests from any origin. This configuration might need to be adjusted depending on your specific deployment environment.
+
+**Security Considerations:**
+
+- This example uses environment variables for sensitive information like AWS credentials. Consider using a more secure method for storing and managing secrets in production environments.
+- The CORS configuration allows requests from any origin. This configuration should be tightened for production environments.
+
+**Contributing:**
+
+We welcome contributions to this project! Please see the CONTRIBUTING.md file for guidelines on how to contribute.
+
+**License:**
+
+This project is licensed under the MIT License. See the LICENSE file for details.