Add initial CentOS 3.9 root filesystem structure and essential scripts

- Created default user environment files: .bash_logout, .bash_profile, and .bashrc.
- Added symbolic links for dynamic linker and various libraries.
- Included essential binaries in /sbin for system management (e.g., fdisk, mkfs, hwclock).
- Implemented RPM verification script to check availability of required packages in CentOS vault.
- Established basic directory structure for logs and mail.
- Added a tarball for external libraries.

centos39-rootfs/etc/skel/.bash_profile

@@ -0,0 +1,13 @@
+# .bash_profile
+
+# Get the aliases and functions
+if [ -f ~/.bashrc ]; then
+	. ~/.bashrc
+fi
+
+# User specific environment and startup programs
+
+PATH=$PATH:$HOME/bin
+
+export PATH
+unset USERNAME