added some vagrant files for experiment

vagrant/readme.txt

@@ -0,0 +1,38 @@
+
+$ vagrant plugin list
+$ dnf install vagrant vagrant-libvirt
+$ vagrant plugin list
+$  (NOT GOOD) vagrant plugin install vagrant-libvirt
+
+# --------------------------------------------------------------------------------
+
+$ vagrant box add generic/rocky8 --provider=libvirt
+
+# --------------------------------------------------------------------------------
+
+$ vagrant box add generic/rocky8
+==> box: Loading metadata for box 'generic/rocky8'
+    box: URL: https://vagrantcloud.com/generic/rocky8
+This box can work with multiple providers! The providers that it
+can work with are listed below. Please review the list and choose
+the provider you will be working with.
+
+1) hyperv
+2) libvirt
+3) parallels
+4) virtualbox
+5) vmware_desktop
+
+Enter your choice: 2
+==> box: Adding box 'generic/rocky8' (v3.4.0) for provider: libvirt
+    box: Downloading: https://vagrantcloud.com/generic/boxes/rocky8/versions/3.4.0/providers/libvirt.box
+    box: Calculating and comparing box checksum...
+==> box: Successfully added box 'generic/rocky8' (v3.4.0) for 'libvirt'!
+
+#
+$ ls -l ~/.vagrant.d/boxes/generic-VAGRANTSLASH-rocky8/3.4.0/libvirt/
+total 1029128
+-rw-rw-r-- 1 hyung-hwan hyung-hwan 1053807104 Aug 29 09:41 box.img
+-rw-rw-r-- 1 hyung-hwan hyung-hwan        301 Aug 29 09:41 info.json
+-rw-rw-r-- 1 hyung-hwan hyung-hwan         59 Aug 29 09:41 metadata.json
+-rw-rw-r-- 1 hyung-hwan hyung-hwan       1987 Aug 29 09:41 Vagrantfile