feat: Add schema file

Changes made:
- Added models.go

Author: PSNAppz

models/models.go

@@ -0,0 +1,33 @@
+package models
+
+import "time"
+
+type User struct {
+	ID        int       `db:"id"`
+	Name      string    `db:"name"`
+	CreatedAt time.Time `db:"created_at"`
+}
+
+type Hashtag struct {
+	ID        int       `db:"id"`
+	Name      string    `db:"name"`
+	CreatedAt time.Time `db:"created_at"`
+}
+
+type Project struct {
+	ID          int       `db:"id"`
+	Name        string    `db:"name"`
+	Slug        string    `db:"slug"`
+	Description string    `db:"description"`
+	CreatedAt   time.Time `db:"created_at"`
+}
+
+type ProjectHashtag struct {
+	HashtagID int `db:"hashtag_id"`
+	ProjectID int `db:"project_id"`
+}
+
+type UserProject struct {
+	ProjectID int `db:"project_id"`
+	UserID    int `db:"user_id"`
+}