docs: added example for derive-secret

examples/derive-secret/README.md

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+# derive secret
+
+```bash
+npx @phala/fn build index.ts
+npx @phala/fn run dist/index.js -a 00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000568656c6c6f000000000000000000000000000000000000000000000000000000
+```

examples/derive-secret/index.ts

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+import '@phala/pink-env'
+import { encodeAbiParameters, decodeAbiParameters } from 'viem'
+
+type Hex = `0x${string}`
+
+export default function main(payload: Hex) {
+  const [requestId, seed] = decodeAbiParameters(
+    [{ type: 'uint256' }, { type: 'bytes' }],
+    payload
+  )
+  const secret = pink.deriveSecret(seed)
+
+  return encodeAbiParameters(
+    [{ type: 'uint256' }, { type: 'string' }],
+    [
+      requestId,
+      secret.toString()
+    ]
+  )
+}

examples/derive-secret/package.json

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+{
+  "name": "derive-secret",
+  "private": true,
+  "version": "0.0.0",
+  "dependencies": {
+    "@phala/pink-env": "^1.0.11"
+  },
+  "devDependencies": {
+    "typescript": "^5.2.2",
+    "@phala/fn": "file:../../"
+  }
+}

examples/derive-secret/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es2020",
+    "module": "commonjs",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true
+  }
+}