Update boto3 python document

docs/sdks/python/example-list-buckets.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+
+import boto3
+s3 = boto3.resource('s3', use_ssl=False, endpoint_url="http://localhost:9000")
+for bucket in s3.buckets.all():
+    print(bucket.name)

docs/sdks/python/python.md

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+# AWS SDK for Python
+
+## Install
+
+### In Python 2.6, 2.7, 3.3, 3.4
+
+**WARNING**: Boto 3 is in *developer preview* and **should not** be used in production yet!
+
+```
+pip install boto3
+```
+
+### Example
+
+Next, set up credentials (in e.g. ``~/.aws/credentials``)::
+
+    [default]
+    aws_access_key_id = YOUR_MINIO_ACCESS_ID
+    aws_secret_access_key = YOUR_MINIO_SECRET_KEY
+
+```
+#!/usr/bin/env python
+
+import boto3
+s3 = boto3.resource('s3', use_ssl=False, endpoint_url="http://localhost:9000")
+for bucket in s3.buckets.all():
+    print(bucket.name)
+...
+bucket1
+bucket2
+bucket3
+```