Add quick-e2e tool for E2E environment setup

tools/quick-e2e/README.md

@@ -0,0 +1,50 @@
+# Quick E2E environment setup
+
+## Features
+
+Generate a new E2E environment with the following options:
+-  **Server type**: paper, folia ...
+-  **Server version**: 1.19.4, 1.20.1 ...
+-  **Server Build**: latest, a specific build
+-  **Pre-installed plugins**: links to modrinth
+-  **Custom plugin providers**: build from monorepo
+-  **EULA**: true, false
+-  **OP**: a specific username
+
+Update an existing E2E environment, if there is a new build or plugin version available.
+
+Delete an existing E2E environment.
+
+## Usage
+
+### Generate a new E2E environment
+
+Command line arguments:
+```bash
+java -jar quick-e2e.jar 
+  --<generate|update|delete>
+  --server-type paper
+  --server-version 1.21.4
+  --server-build latest
+  --pre-installed-plugins "viaversion,luckperms,worldedit"
+  --custom-plugin-providers "monorepo"
+  --eula true
+  --op "OliverHD"
+```
+
+Configuration file:
+```json
+{
+  "serverType": "paper",
+  "serverVersion": "1.21.4",
+  "serverBuild": "latest",
+  "preInstalledPlugins": ["viaversion", "luckperms", "worldedit"],
+  "customPluginProviders": ["monorepo"],
+  "eula": true,
+  "op": "OliverHD"
+}
+```
+
+```bash
+java -jar quick-e2e.jar --generate --config-file config.json
+```