Add claim instructions and rules to Claim component

src/components/Claim.tsx

@@ -30,6 +30,13 @@ export default function () {
   return (
     <div className="flex flex-col items-stetch gap-4">
       <h2>NEW 😱 CLAIM $SPAM FOR FARCASTER ACTIVITY!</h2>
+      <ul>
+        <li>You get 5 $SPAM for every unique cast containing "$SPAM"</li>
+        <li>Casts that only contain the word $SPAM don't count</li>
+        <li>Every like on a cast increases the claim for the cast by 1%</li>
+        <li>So does every recast</li>
+        <li>Go use $SPAM in your casts!</li>
+      </ul>
       <ConnectButton />
       {isConnected && (
         <>