doc: add current status of tinygo based on issue #2979

tools/tinygobb/README.md

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+# Status of tinygo in u-root
+
+Currently, many of the busybox commands fail to build using tinygo.
+This document aims to cover the current process of enabling all subcommands to be built using tinygo.
+While enabling more and more commands the list of working commands in this document will be updated.
+
+## building
+Since currently the tinygo support is lacking, many commands got the `!tinygo` build tag.
+This prohibits building, so anyone recreating the build steps should be aware that this has to be removed for each command.
+The list below is the result of building each subcommand individually for x86_64 linux.
+
+The neccessary additions to tinygo will be tracked in the according issue that this document is based on [#2979](https://github.com/u-root/u-root/issues/2979).
+
+## command list
+### core
+41 tinygo build errors found.
+ - [ ] `bind`
+ - [ ] `df`
+ - [ ] `dhclient`
+ - [ ] `dmesg`
+ - [ ] `elvish`
+ - [ ] `fusermount`
+ - [ ] `gosh`
+ - [ ] `gpgv`
+ - [ ] `gzip`
+ - [ ] `hostname`
+ - [ ] `hwclock`
+ - [ ] `init`
+ - [ ] `insmod`
+ - [ ] `ip`
+ - [ ] `kexec`
+ - [ ] `lockmsrs`
+ - [ ] `losetup`
+ - [ ] `mkfifo`
+ - [ ] `mknod`
+ - [ ] `mount`
+ - [ ] `msr`
+ - [ ] `netcat`
+ - [ ] `ntpdate`
+ - [ ] `ping`
+ - [ ] `poweroff`
+ - [ ] `rmmod`
+ - [ ] `shutdown`
+ - [ ] `sluinit`
+ - [ ] `sshd`
+ - [ ] `strace`
+ - [ ] `stty`
+ - [ ] `switch_root`
+ - [ ] `tee`
+ - [ ] `truncate`
+ - [ ] `umount`
+ - [ ] `uname`
+ - [ ] `watchdog`
+ - [ ] `watchdogd`
+ - [ ] `wget`
+ - [ ] `which`
+ - [ ] `nohup`
+
+64 cmds build successful
+- [x] `backoff`
+- [x] `base64`
+- [x] `basename`
+- [x] `blkid`
+- [x] `cat`
+- [x] `chmod`
+- [x] `chroot`
+- [x] `cmp`
+- [x] `comm`
+- [x] `cp`
+- [x] `cpio`
+- [x] `date`
+- [x] `dd`
+- [x] `dirname`
+- [x] `echo`
+- [x] `false`
+- [x] `find`
+- [x] `free`
+- [x] `gpt`
+- [x] `grep`
+- [x] `hexdump`
+- [x] `id`
+- [x] `io`
+- [x] `kill`
+- [x] `lddfiles`
+- [x] `ln`
+- [x] `ls`
+- [x] `lsdrivers`
+- [x] `lsmod`
+- [x] `man`
+- [x] `md5sum`
+- [x] `mkdir`
+- [x] `mktemp`
+- [x] `more`
+- [x] `mv`
+- [x] `pci`
+- [x] `printenv`
+- [x] `ps`
+- [x] `pwd`
+- [x] `readlink`
+- [x] `rm`
+- [x] `rsdp`
+- [x] `scp`
+- [x] `seq`
+- [x] `shasum`
+- [x] `sleep`
+- [x] `sort`
+- [x] `strings`
+- [x] `sync`
+- [x] `tail`
+- [x] `tar`
+- [x] `time`
+- [x] `timeout`
+- [x] `touch`
+- [x] `tr`
+- [x] `true`
+- [x] `ts`
+- [x] `uniq`
+- [x] `unmount`
+- [x] `unshare`
+- [x] `uptime`
+- [x] `wc`
+- [x] `xargs`
+- [x] `yes`
+
+### exp
+30 tinygo build errors found.
+ - [ ] `bootvars`
+ - [ ] `bzimage`
+ - [ ] `console`
+ - [ ] `disk_unlock`
+ - [ ] `efivarfs`
+ - [ ] `esxiboot`
+ - [ ] `getty`
+ - [ ] `hdparm`
+ - [ ] `ipmidump`
+ - [ ] `kconf`
+ - [ ] `modprobe`
+ - [ ] `netbootxyz`
+ - [ ] `newsshd`
+ - [ ] `nvme_unlock`
+ - [ ] `page`
+ - [ ] `partprobe`
+ - [ ] `pflask`
+ - [ ] `pox`
+ - [ ] `pxeserver`
+ - [ ] `run`
+ - [ ] `smbios_transfer`
+ - [ ] `ssh`
+ - [ ] `syscallfilter`
+ - [ ] `uefiboot`
+ - [ ] `vboot`
+ - [ ] `vmboot`
+ - [ ] `dumpmemmap`
+ - [ ] `fbnetboot`
+ - [ ] `localboot`
+ - [ ] `systemboot`
+
+27 cmds build successful
+- [x] `acpicat`
+- [x] `acpigrep`
+- [x] `ansi`
+- [x] `cbmem`
+- [x] `crc`
+- [x] `dmidecode`
+- [x] `dumpebda`
+- [x] `ectool`
+- [x] `ed`
+- [x] `fbsplash`
+- [x] `fdtdump`
+- [x] `field`
+- [x] `fixrsdp`
+- [x] `forth`
+- [x] `freq`
+- [x] `lsfabric`
+- [x] `madeye`
+- [x] `readelf`
+- [x] `readpe`
+- [x] `rush`
+- [x] `smn`
+- [x] `srvfiles`
+- [x] `tac`
+- [x] `tcz`
+- [x] `watch`
+- [x] `zbi`
+- [x] `zimage`
+