Create share table and repository. (#930)

* Add share table and repository

* Add datastore mock

* Try fixing indent

* Try fixing indent - 2

* Try fixing indent - 3

* Implement rest.Repository and rest.Persistance

* Renew date

* Better error handling

* Improve field name

* Fix json name conventionally

db/migration/20210530121921_create_shares_table.go

@@ -0,0 +1,34 @@
+package migrations
+
+import (
+	"database/sql"
+
+	"github.com/pressly/goose"
+)
+
+func init() {
+	goose.AddMigration(upCreateSharesTable, downCreateSharesTable)
+}
+
+func upCreateSharesTable(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+create table share
+(
+	id             varchar(255) not null primary key,
+	name           varchar(255) not null unique,
+	description    varchar(255),
+	expires        datetime,
+	created        datetime,
+	last_visited   datetime,
+	resource_ids   varchar not null,
+	resource_type  varchar(255) not null,
+	visit_count    integer default 0
+);
+`)
+
+	return err
+}
+
+func downCreateSharesTable(tx *sql.Tx) error {
+	return nil
+}