docs: add prepare markdown

website/docs/dev/_category_.json

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+{
+  "label": "Develop",
+  "position": 99
+}

website/docs/dev/prepare.md

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+---
+sidebar_position: 1
+---
+
+# Prepare To Develop
+
+## Prepare Database which using docker
+
+```bash
+docker run --name tianji-pg -e POSTGRES_DB=tianji -e POSTGRES_USER=tianji -e POSTGRES_PASSWORD=tianji -d postgres:15.4-alpine
+```
+
+
+## Prepare .env file
+
+```bash
+cp .env.example src/server/.env
+```
+
+config `DATABASE_URL` with `postgresql://tianji:tianji@localhost:5432/tianji?schema=public`
+
+Like this:
+
+```ini
+DATABASE_URL="postgresql://tianji:tianji@localhost:5432/tianji?schema=public"
+ALLOW_OPENAPI=true
+```
+
+## Prepare Database struct
+
+Now you can visit database, and you can visit 
+
+```bash
+cd src/server && pnpm db:migrate:apply
+```
+
+## Default Account
+
+Default Account is `admin`/`admin`