Add project files

T120B165-ImgBoard/Data/DbInitializer.cs

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+using Microsoft.AspNetCore.Identity;
+using T120B165_ImgBoard.Models;
+
+namespace T120B165_ImgBoard.Data;
+
+public static class DbInitializer
+{
+    public static async Task SeedRolesAsync(IServiceProvider serviceProvider)
+    {
+        var roleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
+        string[] roleNames = [UserRoles.Admin, UserRoles.Regular];
+        foreach (var roleName in roleNames)
+        {
+            if (!await roleManager.RoleExistsAsync(roleName))
+            {
+                await roleManager.CreateAsync(new IdentityRole(roleName));
+            }
+        }
+    }
+}

T120B165-ImgBoard/Data/ImgBoardContext.cs

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+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
+using T120B165_ImgBoard.Models;
+using File = T120B165_ImgBoard.Models.File;
+
+namespace T120B165_ImgBoard.Data;
+
+public class ImgBoardContext(DbContextOptions<ImgBoardContext> options) : IdentityDbContext<User>(options)
+{
+    public DbSet<RefreshToken> RefreshTokens { get; set; }
+    
+    public DbSet<Tag> Tags { get; set; }
+    public DbSet<Post> Posts { get; set; }
+    public DbSet<Comment> Comments { get; set; }
+    public DbSet<File> Files { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<RefreshToken>().ToTable("RefreshTokens");
+
+        modelBuilder.Entity<Tag>().ToTable("Tags");
+        modelBuilder.Entity<Post>().ToTable("Posts");
+        modelBuilder.Entity<File>().ToTable("Files");
+        modelBuilder.Entity<Comment>().ToTable("Comments");
+    }
+}