Add README.md for fragments

fragments/README.md

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+# Fragments
+These are Nix modules which aim to configure only one aspect of the system.
+This can include installing and configuring single programs such as Steam,
+MangoHud, Syncthing, or OpenSSH, as well as setting generic options for certain
+hardware setups, such as NVIDIA PRIME Offloading.
+
+## TODO
+These are some fragments that I want to create:
+- hardware/nvidia
+- hardware/nvidia-supergfxd
+- hardware/printing
+	- CUPS
+	- QZTray (maybe?)
+- software/steam
+- software/syncthing
+- software/libreoffice
+- software/ssh
+- software/gnupg
+- software/pam-gnupg (dep. software/gnupg)