db schemas beginning

backend/database/sql/schemas/artists.sql

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+CREATE TABLE artists (
+  id   INTEGER PRIMARY KEY,
+  name text    NOT NULL
+);

backend/database/sql/schemas/audio_files.sql

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+CREATE TABLE audio_files (
+  id uuid PRIMARY KEY,
+  file_path text NOT NULL,
+  file_type text  NOT NULL,
+  length_seconds int NOT NULL
+);

backend/database/sql/schemas/file_types.sql

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+CREATE TABLE file_types (
+  id   INTEGER PRIMARY KEY,
+  extension text    NOT NULL
+);

backend/database/sql/schemas/recordings.sql

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+CREATE TABLE recordings (
+  id   INTEGER PRIMARY KEY,
+  name text    NOT NULL
+);
+

backend/database/sql/schemas/release_groups.sql

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+CREATE TABLE release_groups (
+  id   INTEGER PRIMARY KEY,
+  name text    NOT NULL
+);