Create s3 config guide

docs/guides/s3-image-upload.md

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+# Guide - Setup HackMD S3 image upload
+
+1. Go to [AWS S3 console](https://console.aws.amazon.com/s3/home) and create a new bucket.
+
+    ![create-bucket](images/s3-image-upload/create-bucket.png)
+
+2. Click on bucket, select **Properties**  on the side panel, and find **Permission** section. Click **Edit bucket policy**.
+
+    ![bucket-property](images/s3-image-upload/bucket-property.png)
+
+3. Enter the following policy, replace `bucket_name` with your bucket name:
+
+    ![bucket-policy-editor](images/s3-image-upload/bucket-policy-editor.png)
+
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Principal": "*",
+            "Action": "s3:GetObject",
+            "Resource": "arn:aws:s3:::bucket_name/uploads/*"
+        }
+    ]
+}
+```
+
+4. Go to IAM console and create a new IAM user. Remember your user credentials(`key`/`access token`)
+
+5. Enter user page, select **Permission** tab, look at **Inline Policies** section, and click **Create User Policy**
+
+    ![iam-user](images/s3-image-upload/iam-user.png)
+
+6. Select **Custom Policy**
+
+    ![custom-policy](images/s3-image-upload/custom-policy.png)
+
+7. Enter the following policy, replace `bucket_name` with your bucket name:
+
+    ![review-policy](images/s3-image-upload/review-policy.png)
+
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Action": [
+                "s3:*"
+            ],
+            "Resource": [
+                "arn:aws:s3:::bucket_name/uploads/*"
+            ]
+        }
+    ]
+}
+```
+
+## Related Tools
+
+* [AWS Policy Generator](http://awspolicygen.s3.amazonaws.com/policygen.html)