Set up the project with initial files and improve development experience

Add .gitignore, .env.example, CONTRIBUTING.md, LICENSE, a preview image, and roadmap to the project.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9111ef36-26c8-4085-84ca-a35dc1fec1b5
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7083d608-d6d3-4a6a-9a27-6286c5109627/910f6160-6716-488e-83e6-61256595c269.jpg

.env.example

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+# Database Configuration
+DATABASE_URL=postgresql://username:password@localhost:5432/dynamodns
+
+# Server Configuration
+PORT=5000
+NODE_ENV=development
+HOST=0.0.0.0
+SESSION_SECRET=your_secure_random_string
+
+# Authentication Configuration
+ENABLE_REGISTRATION=false
+DEFAULT_ADMIN_USERNAME=admin
+DEFAULT_ADMIN_PASSWORD=admin  # Change this in production!
+DEFAULT_ADMIN_EMAIL=admin@example.com
+
+# LDAP Authentication (Optional)
+LDAP_ENABLED=false
+LDAP_URL=ldap://ldap.example.com
+LDAP_BIND_DN=cn=admin,dc=example,dc=com
+LDAP_BIND_PASSWORD=your_ldap_password
+LDAP_SEARCH_BASE=ou=users,dc=example,dc=com
+LDAP_SEARCH_FILTER=(uid={{username}})
+LDAP_USER_ATTR_USERNAME=uid
+LDAP_USER_ATTR_EMAIL=mail
+LDAP_USER_ATTR_DISPLAY_NAME=cn
+
+# OpenID Connect Authentication (Optional)
+OIDC_ENABLED=false
+OIDC_ISSUER=https://auth.example.com
+OIDC_CLIENT_ID=your_client_id
+OIDC_CLIENT_SECRET=your_client_secret
+OIDC_CALLBACK_URL=https://dynamodns.example.com/api/auth/oidc/callback
+OIDC_SCOPE="openid profile email"
+
+# Logging
+LOG_LEVEL=info