add README.md

README.md

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+# PowerDNS Docker container
+
+* Debian slim based image
+* PowerDNS package from Debian
+* Bind backend support only
+
+# Usage
+
+```
+$ mkdir zones
+$ cat > zones/example.tld <<EOT
+\$TTL    3600
+@       IN      SOA     ns1.example.tld. hostmaster.example.tld. (
+                        2022010101      ; Serial
+                        8H              ; Refresh
+                        1H              ; Retry
+                        1W              ; Expire
+                        1H )            ; Negative Cache TTL
+
+                NS      ns1.example.tld.
+
+                A       192.0.2.1
+                AAAA    2001:db8::1
+EOT
+$ cat > named.conf <<EOT
+zone "example.tld" { type master; file "/var/lib/powerdns/zones/example.tld"; allow-query { any; }; };
+EOT
+
+$ docker run -it \
+    --name powerdns \
+    -v $(pwd)/named.conf:/etc/powerdns/named.conf \
+    -v $(pwd)/zones/:/var/lib/powerdns/zones/ \
+    -p 5353:53/udp -p 5353:53 \
+    pommib/powerdns:4.4-bullseye
+
+$ dig +short @127.0.0.1 -p5353 example.tld A
+192.0.2.1
+```
+
+# docker-compose
+
+```
+version: "3"
+
+services:
+  powerdns:
+    container_name: powerdns
+    image: pommib/powerdns:4.4-bullseye
+    ports:
+      - "5353:53/tcp"
+      - "5353:53/udp"
+    volumes:
+      - '${PWD}/named.conf:/etc/powerdns/named.conf'
+      - '${PWD}/zones/:/var/lib/powerdns/zones/'
+```