Add todo to readme

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+# qeval
+
+qeval is a toy to safely-ish (beware bugs and hardware limitations) execute malicious/untrusted code.
+It's inspired by [shbot](https://github.com/geirha/shbot), but none of the code was taken from there.
+
+There are currently evaluators for
+
+* Perl 5
+* Rust nightly
+* Go
+* C (gcc)
+* C (tcc)
+* C++ (gcc)
+* Java (openjdk)
+* Python 3
+* Python 2
+* Ruby
+* Bash
+* Ash (from busybox)
+* NodeJS
+* Lua
+* PHP
+* Racket
+* Guile
+* Haskell
+* Qalculate (which doesn't really need the sandboxing)
+
+Perl is currently the fastest evaluator, taking 0.16s on my laptop for a simple `print 42`.
+
+
 ### Example usage
 
 ```sh
+# This may build Linux, QEMU, and Perl. Use evaluators.sh if you're impatient
 $ cd $(nix-build --no-out-link . -A evaluators.all)
 $ bin/sh id
 uid=0(root) gid=0 groups=0
 ```
+
+### Todo
+
+* Disk hotplug to reduce amount of disk suspensions (and be able to mlock the remaining one)
+* More sophisticated control processes
+  * Quicker abort when output has reached size limit
+  * Report exit status, memory usage (and OOM), other statistics (count syscalls?)
+  * Multi-line input