add dnsssh workshop

slides/dnsssh/dnsssh.md

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+# DNS, SSH, HTTP
+
+# DNS
+
+![Image](slides/dnsssh/dns.jpeg)
+
+# DNS
+
+- UDP/TCP
+- centralizovan protokol (hijerarhijska struktura)
+- klijent-server struktura
+- klijent, resolver, nameserver
+- tipovi DNS podataka
+
+# SSH
+
+- TCP
+- ssh user@1.2.3.4
+- javni i privatni ssh kljucevi
+- ssh jump (ssh -J user@proxy user@1.2.3.4)
+
+# HTTP
+
+- TCP
+- klijent-server struktura
+- nginx, apache, httpd
+- nginx reverse proxy