fix: update inmemory node example to use sdk@5.1.0

examples/node/.gitignore

@@ -1 +1,2 @@
-db
+db
+.env

examples/node/README.md

@@ -0,0 +1,38 @@
+# Node Examples
+
+## Prerequisites
+
+- You will need a working mediatorDID, we are currently running a v1 mediator.
+
+## Installation
+
+In this directory, you'll need to run
+
+```bash
+npm install
+```
+
+## Environment Variables
+
+Set up a `.env` file in this folder, see `.env.example`
+
+```bash
+MEDIATOR_DID=
+```
+
+## Running the tests
+
+For the 
+```
+npm run start:inmemory
+```
+
+TODO
+```
+npm run start:leveldb
+```
+
+TODO:
+```
+npm run start:indexdb
+```