sys/README: update README.md

Add missing directories and fix alphabetical ordering

Signed-off-by:	Minsoo Choo <minsoo@minsoo.io>
Sponsored by:	FreeBSD Foundation
Reviewed by:	imp, mhorne, pouria
Pull-Request:	https://github.com/freebsd/freebsd-src/pull/2146

sys/README.md

@@ -27,19 +27,24 @@ Source Roadmap:
 | amd64 | AMD64 (64-bit x86) architecture support |
 | arm | 32-bit ARM architecture support |
 | arm64 | 64-bit ARM (AArch64) architecture support |
+| bsm | Basic Security Module headers - `audit(4)` and `bsm(3)` |
 | cam | Common Access Method storage subsystem - `cam(4)` and `ctl(4)` |
 | cddl | CDDL-licensed optional sources such as DTrace |
-| conf | kernel build glue |
 | compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
+| conf | kernel build glue |
 | contrib | 3rd-party imported software such as OpenZFS |
 | crypto | crypto drivers |
 | ddb | interactive kernel debugger - `ddb(4)` |
-| fs | most filesystems, excluding UFS, NFS, and ZFS |
 | dev | device drivers and other arch independent code |
+| dts | FreeBSD-specific device tree sources |
+| fs | most filesystems, excluding UFS, NFS, and ZFS |
 | gdb | kernel remote GDB stub - `gdb(4)` |
 | geom | GEOM framework - `geom(4)` |
+| gnu | GPL-licensed sources |
 | i386 | i386 (32-bit x86) architecture support |
+| isa | PC ISA bus implementation |
 | kern | main part of the kernel |
+| kgssapi | kernel-space GSSAPI implementation |
 | libkern | libc-like and other support functions for kernel use |
 | modules | kernel module infrastructure |
 | net | core networking code |
@@ -48,13 +53,25 @@ Source Roadmap:
 | netinet | IPv4 protocol implementation - `inet(4)` |
 | netinet6 | IPv6 protocol implementation - `inet6(4)` |
 | netipsec | IPsec protocol implementation - `ipsec(4)` |
+| netlink | kernel network configuration protocol - `netlink(4)` |
 | netpfil | packet filters - `ipfw(4)`, `pf(4)`, and `ipfilter(4)` |
+| netsmb | Server Message Block protocol implementation |
+| nfs | common code and headers for Network File System |
+| nfsclient | NFS client implementation for mounting and stats |
+| nfsserver | NFS server implementation for exporting local filesystems to network |
+| nlm | Network Lock Management protocol implementation |
+| ofed | OpenFabrics Enterprise Distribution implementation |
 | opencrypto | OpenCrypto framework - `crypto(7)` |
 | powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
 | riscv | 64-bit RISC-V architecture support |
+| rpc | Open Network Computing Remote Procedure Call implementation - `rpc(3)` |
 | security | security facilities - `audit(4)` and `mac(4)` |
 | sys | kernel headers |
+| teken | terminal emulation interface implementation - `teken(3)` |
 | tests | kernel unit tests |
+| tools | kernel build scripts and utilities |
 | ufs | Unix File System - `ffs(4)` |
 | vm | virtual memory system |
 | x86 | code shared by AMD64 and i386 architectures |
+| xdr | External Data Representation implementation - `xdr(3)` |
+| xen | Xen hypervisor support - `xen(4)` |