implemented README

README.md

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+A plugin to override A and AAAA records with a custom value. 
+I made this to override the public IP address of my server with its VPN IP address.
+
+There is probably a better way to do this, but I couldn't find it.
+
+# Usage
+
+Add this to your `plugin.cfg`:
+```
+    override:git.kapelle.org/niklas/coredns-override
+```
+
+In your `Corefile`:
+```
+. {
+    override {
+        12.34.56.78 10.0.0.1
+        98.76.54.32 10.0.0.2
+    }
+
+    forward . 1.1.1.1
+}
+```
+
+