update .gitignore and readme

.gitignore

@@ -1,3 +1,7 @@
+tmp/
+.*.swp
+
+
 # ---> macOS
 # General
 .DS_Store
@@ -7,6 +11,7 @@
 # Icon must end with two \r
 Icon
 
+
 # Thumbnails
 ._*
 

README.md

@@ -1,3 +1,8 @@
 # hswro-vm-provisioning
 
 VM provisioning for HSWro servers
+
+In this repo we have a couple files:
+
+- preseed.cfg - used as a preseed for debian install
+- post-install.sh - invoked as preseed late-command, it takes care of creating users and adding their ssh keys so they can access freshly created host via SSH