updated README

Author: dmalan

README.md

@@ -19,3 +19,27 @@ f = cs50.get_float();
 i = cs50.get_int();
 s = cs50.get_string();
 ```
+
+## Testing
+
+1. Run `cli50` in `python-cs50`.
+1. Run `sudo su -`.
+1. Run `apt install -y libmysqlclient-dev mysql-server postgresql`.
+1. Run `pip3 install mysqlclient psycopg2-binary`.
+1. In `/etc/mysql/mysql.conf.d/mysqld.conf`, add `skip-grant-tables` under `[mysqld]`.
+1. In `/etc/profile.d/cli.sh`, remove `valgrind` function for now.
+1. Run `service mysql start`.
+1. Run `mysql -e 'CREATE DATABASE IF NOT EXISTS test;'`.
+1. In `/etc/postgresql/10/main/pg_hba.conf, change:
+   ```
+   local   all             postgres                                peer
+   host    all             all             127.0.0.1/32            md5
+   ```
+   to:
+   ```
+   local   all             postgres                                trust
+   host    all             all             127.0.0.1/32            trust
+   ```
+1. Run `service postgresql start`.
+1. Run `psql -c 'create database test;' -U postgres.
+1. Run `touch test.db`.