Create s3 user and policy guide

docs/s3_user_policy.md

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+# AWS S3 Bucket: How to configure user's policy
+
+Using the principle of least privilege is crucial for security when allowing a third party system to access your AWS resources.
+
+**Prerequisites**: Ensure you have an AWS account and administrative access to manage IAM policies.
+
+## Step 1: Create a new IAM Policy
+
+1. Log in to your AWS Management Console.
+1. Navigate to the IAM Policies section.
+1. Create a new policy with the following configuration.
+
+**Note**: `my-bucket` is a placeholder. For example, if your bucket's name is `obsidian-data`, the resource line should read `arn:aws:s3:::obsidian-data`.
+
+```JSON
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Sid": "ObsidianBucket",
+            "Effect": "Allow",
+            "Action": [
+                "s3:ListBucket"
+            ],
+            "Resource": "arn:aws:s3:::my-bucket"
+        },
+        {
+            "Sid": "ObsidianObjects",
+            "Effect": "Allow",
+            "Action": [
+                "s3:PutObject",
+                "s3:GetObject",
+                "s3:DeleteObject"
+            ],
+            "Resource": "arn:aws:s3:::my-bucket/*"
+        }
+    ]
+}
+```
+> The policy allows the Obsidian plugin to list, add, retrieve, and delete objects in the specified S3 bucket.
+
+## Step 2: Attach the Policy to Obsidian user
+
+1. Create a new user in the IAM console. (Never use your own root user, as it would have full access to your AWS account).
+1. When creating the user, select "Attach policy directly" and select the policy created.
+1. Edit the recent created user and go to "Security Credentials" tab to create your access key.
+1. Create an Access Key. If asked for a "use case", select "other"
+1. Use the credentials in the plugin settings. (NEVER share these credentials)
+
+> PS. The bucket doesn't need to have a policy, only the user.
+
+## Verifying the Policy
+
+After attaching the policy, test it by trying to access the S3 bucket through the Obsidian plugin. Ensure that all intended actions can be performed without errors.
+
+## Troubleshooting
+
+If you encounter permission errors, check the policy for typos in the bucket name or actions. Ensure the policy is attached to the correct user.