Add local development helper doc

LOCAL_DEV.md

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+# Local development
+
+Steps to install and configure Postgres on Mac for developing against locally
+
+1. Install homebrew
+2. Install postgres
+   ```sh
+   brew install postgresql
+   ```
+3. Create a database
+   ```sh
+   createdb test
+   ```
+4. Create SSL certificates
+   ```sh
+   cd /opt/homebrew/var/postgresql@14
+   openssl genrsa -aes128 2048 > server.key
+   openssl rsa -in server.key -out server.key
+   chmod 400 server.key
+   openssl req -new -key server.key -days 365 -out server.crt -x509
+   cp server.crt root.crt
+   ```
+5. Update config in `/opt/homebrew/var/postgresql@14/postgresql.conf`
+
+   ```conf
+   listen_addresses = '*'
+
+   password_encryption = md5
+
+   ssl = on
+   ssl_ca_file = 'root.crt'
+   ssl_cert_file = 'server.crt'
+   ssl_crl_file = ''
+   ssl_crl_dir = ''
+   ssl_key_file = 'server.key'
+   ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
+   ssl_prefer_server_ciphers = on
+   ```
+
+6. Start Postgres server
+   ```sh
+   /opt/homebrew/opt/postgresql@14/bin/postgres -D /opt/homebrew/var/postgresql@14
+   ```