Use syncpack to manage dependencies

[Syncpack](https://jamiemason.github.io/syncpack/) is a tool that helps manage
multiple package.json files in a monorepo.

To list dependencies from all packages run:
```sh
syncpack list
```

To update a dependency (e.g. `eslint`) in all packages run:
```sh
syncpack update --filter eslint
```

.gitignore

@@ -0,0 +1 @@
+node_modules/

.syncpackrc

@@ -0,0 +1,6 @@
+{
+  "dependencyTypes": [
+    "prod",
+    "dev"
+  ]
+}

README.md

@@ -22,3 +22,28 @@ To setup the hooks follow the steps:
     ```sh
     pre-commit install
     ```
+
+### Syncpack
+
+[Syncpack](https://jamiemason.github.io/syncpack/) is a tool that helps manage
+multiple package.json files in a monorepo.
+
+#### Install
+
+In the repository's root directory execute:
+
+```sh
+yarn install
+```
+
+#### Usage
+
+To list dependencies from all packages run:
+```sh
+syncpack list
+``` 
+
+To update a dependency (e.g. `eslint`) in all packages run:
+```sh
+syncpack update --filter eslint
+```

package.json

@@ -0,0 +1,11 @@
+{
+  "private": true,
+  "workspaces": [
+    "./core",
+    "./dapp",
+    "./website"
+  ],
+  "devDependencies": {
+    "syncpack": "^11.2.1"
+  }
+}