feat: added npm run start and npm run dev

These 2 commands launch the Polykey Agent.  The difference is that
`npm run dev` uses `nodemon`. This monitors the `src`, `package.json`,
`package-lock.json` and `tsconfig.json` and will auto-reload the Polykey
agent by sending `SIGTERM` to it. Note that auto-reloading is best used
with defined environment variables in the `.env`, in particular
`PK_PASSWORD` and `PK_NODE_PATH`. During development, you can define
other env variables which will ensure a repeatable agent server that
uses the same host and port.

The `nodemon` is controlled by `nodemon.json`. It automatically uses
`ts-node` to run the TS code. It is possible to force a restart by
running `rs` too.

Author: CMCDragonkai

.npmignore

@@ -5,6 +5,7 @@
 /tsconfig.build.json
 /babel.config.js
 /jest.config.js
+/nodemon.json
 /scripts
 /src
 /tests

nodemon.json

@@ -0,0 +1,12 @@
+{
+  "restartable": "rs",
+  "verbose": true,
+  "watch": [
+    "./src/**",
+    "./package.json",
+    "./package-lock.json",
+    "./tsconfig.json"
+  ],
+  "ext": "ts,js,json",
+  "signal": "SIGTERM"
+}