Added Fablo Sample Gateway Connection for Node.js (hyperledger-labs#541)

Signed-off-by: Ronald L <ronaldlong46@icloud.com>
Co-authored-by: Jakub Dzikowski <jakub.t.dzikowski@gmail.com>

Author: ronaldl29

samples/gateway/node/.env.example

@@ -0,0 +1,9 @@
+CHANNEL_NAME=my-channel1
+CONTRACT_NAME=chaincode1
+PEER_GATEWAY_URL=localhost:7041
+PEER_ORG_NAME=peer0.org1.example.com
+MSP_ID=Org1MSP
+TLS_ROOT_CERT=../../../fablo-target/fabric-config/crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt
+CREDENTIALS=../../../fablo-target/fabric-config/crypto-config/peerOrganizations/org1.example.com/users/User1@org1.example.com/msp/signcerts/User1@org1.example.com-cert.pem
+PRIVATE_KEY_PEM=../../../fablo-target/fabric-config/crypto-config/peerOrganizations/org1.example.com/users/User1@org1.example.com/msp/keystore/priv-key.pem
+

samples/gateway/node/README.md

@@ -0,0 +1,25 @@
+# Purpose
+To provide an example connection of Fablo with Node.js.
+
+# Pre-requisites
+Docker
+
+Node >22
+
+Git
+
+# Instructions
+1. (If Fablo is not already installed) Clone the Fablo repo with `https://github.com/hyperledger-labs/fablo.git` and then `cd fablo`.
+2. Start Docker.
+3. Run `fablo up samples/fablo-config-hlf3-1orgs-1chaincode.json`.
+4. Once Fablo is running, run `cd samples/gateway/node`.
+5. Now install the Node server's dependencies with `npm i`.
+6. Now let's copy the environment example to a usable file `cp .env.example .env`.
+7. Start the node server with `node --env-file=.env server.js`.
+
+You should see a response like this:
+```
+Put result: {"success":"OK"}
+Get result: {"success":"2025-04-29T16:13:42.097Z"}`
+```
+