Improve README.md

README.md

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 # PKGBUILDs
-Contains PKGBUILD files for creating Arch Linux packages of my own and
-some other applications.
+Contains PKGBUILD files for creating Arch Linux packages:
 
-For some applications it also provides PKGBUILD files for the creation
-of Windows binaries with the Mingw-w64 cross compiler.
+* Packages for my own applications and libraries such as [Syncthing Tray](https://github.com/Martchus/syncthingtray),
+  [Tag Editor](https://github.com/Martchus/tageditor), [Password Manager](https://github.com/Martchus/passwordmanager), ...
+* Packages [I maintain in the AUR](https://aur.archlinux.org/packages/?O=0&SeB=M&K=Martchus&outdated=&SB=v&SO=d&PP=50&do_Search=Go):
+    * misc packages, eg. Gogs/Gitea, Subtitle Composer, openelec-dvb-firmware
+    * mingw-w64 packages which allow to build for Windows under Arch Linux, eg. freetype2 and Qt 5
+    * apple-darwin packages which allow to build for MaxOS X under Arch Linux, eg. osxcross and Qt 5
+* Other packages imported from the AUR to build with slight modifications
+
+So if you like to improve one of my AUR packages, just create a PR here.
+
+## Structure
+Each package is in its own subdirectoy:
+```
+default-pkg-name/variant
+```
+where `default-pkg-name` is the of the default package name (eg. `qt5-base`) and `variant` usually one of:
+
+* `default`: the regular package
+* `git`/`svn`/`hg`: the development version
+* `mingw-w64`: the Windows version
+* `apple-darwin`: the MacOS X version
+
+The repository does not contain `.SRCINFO` files.
+
+## Binary repository
+I also provide a [binary repository](https://martchus.no-ip.biz/repo/arch/ownstuff/os) containing the packages found
+in this repository and a lot of packages found in the AUR.
 
-I also provide a [binary repository](https://martchus.no-ip.biz/repo/arch/ownstuff/os).
 For more information visit my [website](https://martchus.no-ip.biz/website/page.php?name=programming).