Update readme

README.md

@@ -1,5 +1,7 @@
 # QuakeSpasm
 
+<img src="Misc/QuakeSpasm_512.png" width="128" />
+
 [![License: GPL v2](https://img.shields.io/badge/License-GPL_v2-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
 
 Forked from Ozkan Sezer's repository. Has some tweaks and hacks here and there that I like to use. For a more stable and cross-platform experience, please use the official QuakeSpasm repository instead.
@@ -12,6 +14,8 @@ GitHub Mirror: https://github.com/sezero/quakespasm
 
 Releases: http://quakespasm.sourceforge.net/download.htm
 
+[QuakeSpasm readme](Quakespasm.txt)
+
 I'll try to keep the `upstream` branch up to date with the official repository.
 
 ## Building & Running
@@ -30,6 +34,12 @@ Then run QuakeSpasm with:
 ./quakespasm
 ```
 
+To clean the build, run:
+
+```
+make clean
+```
+
 This version enables SDL2 by default. To use SDL-1.2, run:
 
 ```