docs: add x402 kora demo (#227)

docs/add x402 kora demo
PRO-353

Author: amilz

.gitignore

@@ -11,7 +11,6 @@ generated/
 # SDK
 node_modules/
 dist/
-.env*
 
 # Coverage reports
 coverage/

docs/x402/demo/.env.example

@@ -0,0 +1,24 @@
+# ==============================================================================
+# SERVER CONFIG
+# ==============================================================================
+FACILITATOR_URL=http://localhost:3000
+FACILITATOR_PORT=3000
+PROTECTED_API_URL=http://localhost:4021/protected
+API_PORT=4021
+KORA_RPC_URL=http://localhost:8080/
+NETWORK=solana-devnet
+
+
+# Should match kora/kora.toml
+KORA_API_KEY=kora_facilitator_api_key_example
+
+# ==============================================================================
+# SIGNER KEYS
+# ==============================================================================
+
+# These will be automatically generated by the `pnpm run setup` command
+
+# KORA_SIGNER_ADDRESS=
+# KORA_SIGNER_PRIVATE_KEY=
+# PAYER_ADDRESS=
+# PAYER_PRIVATE_KEY=