chore(readme): add detection list

README.md

@@ -3,11 +3,24 @@
 A fetch tool written in x86-64 assembly for Linux.
 Runs in under 150 microseconds and has zero dependencies.
 
-There is almost no error handling and lots of things may break.
-Please report any bugs you find.
-
 ![Preview](/asmfetch.png)
 
+## Detections
+
+- username (`$USER`)
+- hostname
+- os name from `/etc/os-release`
+- kernel
+    - name
+    - version
+    - architecture
+- shell (`$SHELL`)
+- uptime
+- desktop (`$XDG_CURRENT_DESKTOP`)
+- display backend (`$XDG_SESSION_TYPE`)
+- memory usage
+- disk usage for `/`
+
 ## Usage
 
 ```shell
@@ -17,6 +30,7 @@ $ ./asmfetch
 
 ## Customization
 
-It wasn't designed to be very customizable or dynamic; tons of values
-are hardcoded, but you can tweak one or two things (including the logo)
-by modifying the includes in `asmfetch.S` and symbols in `symbols.S`.
+asmfetch wasn't designed to be very customizable or dynamic; tons of
+values (e.g. the logo, symbols, format, colors) are hardcoded. The
+only way to change them is by modifying the source code, specifically
+the `include`ed files in `asmfetch.S` and symbols in `symbols.S`.