Define table schema and CSVs to populate the database

TL;DR:
- Created src/init.sql, which defines the tables
- Created a data/ directory to house .csv data to populate our db
- Updated the README with usage instructions

.gitignore

@@ -1,3 +1,4 @@
 *.db
+*.sqlite3
 *.db-shm
 *.db-wal

README.md

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+# TopTal take-home #2
+
+All of the commands defined herein should be run from the top-level directory of
+this repository (i.e. the directory in which this file exists).
+
+## Database
+
+Create a new database named `db.sqlite3` with:
+
+```shell
+$ sqlite3 db.sqlite3
+```
+
+Initialize the schema with:
+
+```
+sqlite> .read src/init.sql
+```
+
+You can verify that you successfully initialized the database by running:
+
+```
+sqlite> .tables
+sqlite> .schema Accounts
+sqlite> .schema Trips
+```
+
+Populate the database with some dummy values using the following:
+
+```
+sqlite> PRAGMA foreign_keys = on;
+sqlite> .mode csv
+sqlite> .import data/accounts.csv Accounts
+sqlite> .import data/trips.csv Trips
+```
+
+You can verify you successfully populated the tables with:
+
+```
+sqlite> .mode columns
+sqlite> .headers on
+sqlite> SELECT * FROM Accounts;
+sqlite> SELECT * FROM Trips;
+```

data/accounts.csv

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+mimi,testing,miriamwright@google.com,user,
+bill,testing,wpcarro@gmail.com,manager,
+wpcarro,testing,wpcarro@google.com,admin,

data/trips.csv

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+mimi,Rome,2020-08-10,2020-15-30,Heading home before the upcoming trip with Panarea.
+mimi,Panarea,2020-08-15,2020-05-30,Exciting upcoming trip with Matt and Sarah!
+mimi,London,2020-08-30,2020-08-30,Heading back to London...

src/init.sql

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+-- Run `.read init.sql` from within a SQLite3 REPL to initialize the tables we
+-- need for this application. This will erase all current entries, so use with
+-- caution.
+-- Make sure to set `PRAGMA foreign_keys = on;` when transacting with the
+-- database.
+
+BEGIN TRANSACTION;
+
+DROP TABLE IF EXISTS Accounts;
+DROP TABLE IF EXISTS Trips;
+
+CREATE TABLE Accounts (
+  username TEXT NOT NULL,
+  password TEXT NOT NULL,
+  email TEXT NOT NULL UNIQUE,
+  role TEXT NOT NULL,
+  profilePicture BLOB,
+  PRIMARY KEY (username)
+);
+
+CREATE TABLE Trips (
+  username TEXT NOT NULL,
+  destination TEXT NOT NULL,
+  startDate TEXT NOT NULL, -- YYYY-MM-DD
+  endDate TEXT NOT NULL, -- YYYY-MM-DD
+  comment TEXT NOT NULL,
+  PRIMARY KEY (username, destination, startDate),
+  FOREIGN KEY (username) REFERENCES Accounts ON DELETE CASCADE
+);
+
+COMMIT;