Add files for docker sql server.

MySQL_docker/Dockerfile

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+FROM mysql:latest
+
+ENV MYSQL_ROOT_PASSWORD=root
+
+COPY highscores_database.sql /docker-entrypoint-initdb.d/

MySQL_docker/highscores_database.sql

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+CREATE DATABASE highscores;
+use highscores;
+
+CREATE TABLE Guilds(
+   GuildId int not null,
+   SubmissionChannel int,
+   UsernameLength smallint DEFAULT 12,
+   VerificationChannel int,
+   PRIMARY KEY (GuildId)
+);
+
+CREATE TABLE CategoryGroups(
+   ChannelId int,
+   GroupId int not null AUTO_INCREMENT,
+   GroupName varchar(50) not null,
+   GuildId int not null,
+   MessageId int,
+   PadLength smallint not null DEFAULT 26,
+   Size smallint not null, -- unsure if I like this name. Also unsure belong here or in Category
+   FOREIGN KEY (GuildId) REFERENCES Guilds(GuildId),
+   PRIMARY KEY (GroupId)
+);
+
+CREATE TABLE Categories(
+   CategoryId int not null AUTO_INCREMENT,
+   CategoryName varchar(30) not null,
+   GroupId int not null,
+   IsAscending boolean not null DEFAULT true,
+   IsTimeRecord boolean not null DEFAULT false,
+   IsValidated boolean not null DEFAULT true,
+   FOREIGN KEY (GroupId) REFERENCES CategoryGroups(GroupId),
+   PRIMARY Key (CategoryId)
+);
+
+CREATE TABLE Scores(
+   UserName varchar(30) not null,
+   Score float not null, -- Maybe should have time and int scores?? timestamp type?
+   CategoryId int not null,
+   FOREIGN KEY (CategoryId) REFERENCES Categories(CategoryId),
+   CONSTRAINT PKScore PRIMARY KEY (CategoryId, UserName) -- i think this means there isnt a column for this key but the key is made up of categoryid and username
+);