Use PUT API for uploading

res/include/md/api.md

@@ -1,4 +1,8 @@
-# Pixeldrain API documentation
+# API documentation
+
+Methods for using pixeldrain programmatically.
+
+## Authentication
 
 The methods for uploading and retrieving files don't require an API key. The
 methods for creating and retrieving lists also don't require an API key. All
@@ -37,6 +41,22 @@ The path is to be appended to the API URL, so "/file/someid/thumbnail" becomes
 The base URL for the API is "{{apiUrl}}", all paths below are relative to that
 URL.
 
+## curl example
+
+Here's how to anonymously upload a file using curl:
+
+```
+curl -T "file_name.txt" https://pixeldrain.com/api/file/
+```
+
+You can also upload a file to your pixeldrain account using curl. Get an API key
+from the [API keys page](/user/api_keys) and enter it in the command. Replace
+the example API key here with your own:
+
+```
+curl -T "file_name.txt" -u :5f45f184-64bb-4eaa-be19-4a5f0459db49 https://pixeldrain.com/api/file/
+```
+
 ## Form value order
 
 I recommend you put files at the end of every file upload form. By doing this