readme updated

Author: Tomasz Szymański

README.md

@@ -1,16 +1,46 @@
-# Simple Storage
-
-File storage made simple.
-
-[![codecov](https://codecov.io/gh/merixstudio/simple-storage/branch/master/graph/badge.svg?token=XMH3S6M34G)](https://codecov.io/gh/merixstudio/simple-storage)
-
-![python](https://img.shields.io/badge/Python-3.6%2B-brightgreen)
-
-## Supported backends
-
-- File system storage
-- AWS S3
-
-## Requirements
-
-- Python >= 3.6
+# Simple Storage
+
+File storage made simple.
+
+[![codecov](https://codecov.io/gh/merixstudio/simple-storage/branch/master/graph/badge.svg?token=XMH3S6M34G)](https://codecov.io/gh/merixstudio/simple-storage)
+
+![python](https://img.shields.io/badge/Python-3.6%2B-brightgreen)
+
+## Supported storages
+
+- File system
+- AWS S3
+
+## Requirements
+
+- Python >= 3.6
+
+# How to use
+
+Install the package:
+
+```shell
+pip install simple-storage
+```
+
+Now, depending on the storage you want to use, follow the instructions below.
+
+## File system storage
+
+| Environment variable | Value                                                               |
+|----------------------|---------------------------------------------------------------------|
+| `STORAGES_BACKEND`   | `storages.backends.file_system.FileSystemStorage`                   |
+| `STORAGES_PATH`      | Point to the existing path in your file system, e.g.  `/app/media`. |
+
+## AWS S3 storage
+
+| Environment variable             | Value                                         |
+|----------------------------------|-----------------------------------------------|
+| `STORAGES_BACKEND`               | `storages.backends.amazon_s3.AmazonS3Storage` |
+| `STORAGES_AWS_ACCESS_KEY_ID`     | Your AWS access key ID.                       |
+| `STORAGES_AWS_SECRET_ACCESS_KEY` | Your AWS secret access key.                   |
+| `STORAGES_BUCKET_NAME`           | The bucket name that you want to use.         |
+
+> In case you encounter any problems with finding your AWS credentials please read [this page][1] as a reference.
+
+[1]: https://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html "Understanding and getting your AWS credentials"