added endpoint documentation

docs/api/models.md

@@ -0,0 +1,33 @@
+# HopFrame Models
+All models used by the RestAPI are listed below
+
+## SingleValueResult
+```csharp
+public struct SingleValueResult<TValue>(TValue value) {
+    public TValue Value { get; set; } = value;
+}
+```
+
+## UserLogin
+```csharp
+public class UserLogin {
+    public string Email { get; set; }
+    public string Password { get; set; }
+}
+```
+
+## UserRegister
+```csharp
+public class UserRegister {
+    public string Username { get; set; }
+    public string Email { get; set; }
+    public string Password { get; set; }
+}
+```
+
+## UserPasswordValidation
+```csharp
+public sealed class UserPasswordValidation {
+    public string Password { get; set; }
+}
+```