Init commit

add security encryption and hashing: WIP
add endpoints: register user, get and save resources
add db main operations, User entity

Azaion.Common/Database/AzaionDbShemaHolder.cs

@@ -0,0 +1,21 @@
+using Azaion.Common.Entities;
+using LinqToDB.Mapping;
+
+namespace Azaion.Common.Database;
+
+public static class AzaionDbSchemaHolder
+{
+    public static readonly MappingSchema MappingSchema;
+
+    static AzaionDbSchemaHolder()
+    {
+        MappingSchema = new MappingSchema();
+        var builder = new FluentMappingBuilder(MappingSchema);
+
+        builder.Entity<User>()
+            .HasTableName("users")
+            .HasIdentity(x => x.Id);
+
+        builder.Build();
+    }
+}