Update README.md

README.md

+# Intro
+
+This uses build.kde.org and its ci-tooling to download builds and extract the
+appstream data from them.
+
+You will needs some space in /tmp and lots of space (20GB) in /srv.
+
 # Tools
 
 ## appstream.rb
@@ -14,13 +21,13 @@ Twiddles the following dirs:
 - `../icons/` icons cache. contains icons named from their appid (org.kde.foo.svg)
 - `../thumbnails` thumbnails cache. scaled to 540 width. subdir per appid
 
-# appstream_mkindex.rb
+## appstream_mkindex.rb
 
 Iters `../appdata/` and generates an `../appdata/index.json` mapping category
 names to appids. The icons for the categories are generated by appstream.rb
 and in `../icons/categories/` as downcased version of the name.
 
-# old_apps_compat.rb
+## old_apps_compat.rb
 
 Iters `../apps/` and generates compatibility rigging to preserve names from
 v1 of the backend, this allows old app urls to remain working.