[Trivial] Add config examples, + a link to RFC (#715)

* Add config examples, + a link to RFC

* regen bytecode

bpf/dns_tracker.h

@@ -10,6 +10,7 @@
 #define DNS_QR_FLAG 0x8000
 #define UDP_MAXMSG 512
 
+// See https://www.rfc-editor.org/rfc/rfc1035 4.1.1. Header section format
 struct dns_header {
     u16 id;
     u16 flags;

examples/direct-flp/README.md

+## Simple example using direct-flp + stdout
+
+```bash
+export FLP_CONFIG=$(cat ./examples/direct-flp/simple-stdout.json)
+export EXPORT="direct-flp"
+sudo -E bin/netobserv-ebpf-agent
+```

examples/direct-flp/simple-stdout.json

+{
+	"pipeline":[
+		{"name": "writer","follows": "preset-ingester"}
+	],
+	"parameters":[
+		{"name": "writer","write": {"type": "stdout"}}
+	]
+}

examples/filters/README.md

+## Simple example filtering on a single IP
+
+```bash
+export ENABLE_FLOW_FILTER="true"
+export FLOW_FILTER_RULES=$(cat ./examples/filters/single-ip.json)
+sudo -E bin/netobserv-ebpf-agent
+```

examples/filters/single-ip.json

+[
+	{"ip_cidr":"192.168.1.20/32", "action": "Accept"}
+]