doc: update README for GFM syntax

README.md

@@ -1,17 +1,17 @@
-A file / image / paste upload server with a focus on embedding.
+# contented
 
-Written in Go
+[![](doc/image1.thumb.png)](doc/image1.png)
+
+A file / image / paste upload server with a focus on embedding.
 
 You can use contented as a standalone upload server, or you can use the SDK to embed its upload widget into another website.
 
-[go-get]code.ivysaur.me/contented git https://git.ivysaur.me/code.ivysaur.me/contented.git[/go-get]
-
-=FEATURES=
+## Features
 
 - Drag and drop upload
 - Multiple files upload
 - Pastebin upload
-- Custom drawing upload ([url=https://github.com/Leimi/drawingboard.js]via[/url])
+- Custom drawing upload ([via drawingboard.js](https://github.com/Leimi/drawingboard.js))
 - Ctrl-V upload
 - SDK-oriented design for embedding, including CORS support
 - Mobile friendly HTML interface
@@ -19,12 +19,13 @@ You can use contented as a standalone upload server, or you can use the SDK to e
 - Hash verification (SHA512/256)
 - Detect duplicate upload content and reuse storage
 - Options to limit the upload filesize and the upload bandwidth
-- Short URLs (using [url=http://hashids.org]Hashids[/url] algorithm)
+- Short URLs (using [Hashids](http://hashids.org) algorithm)
 - Image thumbnailing
 
-=USAGE (SERVER)=
+## Usage (Server)
 
-`Usage of contented:
+```
+Usage of contented:
   -data string
         Directory for stored content (default "")
   -db string
@@ -45,28 +46,31 @@ You can use contented as a standalone upload server, or you can use the SDK to e
         Trust X-Forwarded-For reverse proxy headers
   -concurrentthumbs
         Simultaneous thumbnail generation (default 16)
-`
+```
 
 If you are hosting behind a reverse proxy, remember to set its post body size parameter appropriately (e.g. `client_max_body_size` for nginx).
 
-=USAGE (HTTP)=
+## Usage (HTTP)
 
 The server responds on the following URLs:
 
-- `/get/{ID}`: Download item content
-- `/info/{ID}`: Get item content metadata (JSON)
-- `/thumb/{Type}/{ID}`: Get item thumbnail image
-- `/about`: Get server metadata (JSON)
+URL                  |Method |Description
+---------------------|-------|--
+`/get/{ID}`          |`GET`  |Download item content
+`/info/{ID}`         |`GET`  |Get item content metadata (JSON)
+`/thumb/{Type}/{ID}` |`GET`  |Get item thumbnail image
+`/about`             |`GET`  |Get server metadata (JSON)
 
-=USAGE (EMBEDDING FOR WEB)=
+## Usage (Embedding for web)
 
 Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element. Your callback will be passed an array of file IDs of any uploaded items.
 
-`<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
+```html
+<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
 contented.init("#target", function(/* String[] */ items) {});
-`
+```
 
-=CHANGELOG=
+## Changelog
 
 NEXT:
 - Feature: Option to limit concurrent thumbnail generation