ctucx.git: gallery

update readme

diff --git a/README.md b/README.md
@@ -1,20 +1,31 @@
 # ctucx' gallery
 a little introduction into this software.
 
-## Install
+## get it 
 ```shell=
 [user@pc ~]$ git clone https://git.ctu.cx/ctucx/gallery/
 [user@pc ~]$ cd gallery/
 [user@pc ~]$ nimble build
 ```
 
-## Use the Programm
+## use it
 ```shell=
 [user@pc ~]$ ./gallery <config.file>
 ```
 
-## Dependencies
+## dependencies
 Dependencies: ImageMagick, nim >= 1.0.6, nimble
 
-## Infos
+## infos
 When running the program, a config file must be specified, then the program creates all necessary HTML and CSS objects to display the pages correctly and creates images in the following sizes: medium: 1920x1080, thumbnail: 200x200
+
+it's recommended to disable caching for the html files, here is an example config snippet for nginx:
+```
+location ~* \.html$ {
+  add_header Last-Modified $date_gmt;
+  add_header Cache-Control 'private no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
+  if_modified_since off;
+  expires off;
+  etag off;
+}
+```