Add integrations anchor and preliminary framework integrations to docs

docs/integrations/frameworks/nestjs.mdx

@@ -0,0 +1,47 @@
+---
+title: "NestJS"
+---
+
+Prerequisite: [Install the CLI](/cli/overview)
+
+## Initialize Infisical for your [NestJS](https://nestjs.com) app
+
+```bash
+# move to your Next.js app
+cd /path/to/project
+
+# initialize infisical
+infisical init
+```
+
+## Modify the start script in your `package.json`
+
+```json
+...
+"scripts": {
+    "prebuild": "rimraf dist",
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "infisical run -- nest start",
+    "start:dev": "infisical run -- nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json"
+}
+...
+```
+
+## Start your server with environment variables injected
+
+```bash
+npm run start
+
+# or start development server
+
+npm run start:dev
+```