Add base models.

compose/app/src/main/java/ru/ulstu/is/pmu/student/model/User.kt

@@ -0,0 +1,40 @@
+package ru.ulstu.`is`.pmu.student.model
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.Ignore
+import androidx.room.PrimaryKey
+
+@Entity
+data class User (
+    @PrimaryKey(autoGenerate = true)
+    val uid: Long?,
+    @ColumnInfo(name = "nickname")
+    val nickname: String,
+    @ColumnInfo(name = "email")
+    val email: String,
+    @ColumnInfo(name = "password")
+    val password: String,
+    @ColumnInfo(name = "balance")
+    val balance: Int
+){
+    @Ignore
+    constructor(
+        nickname: String,
+        email: String,
+        password: String,
+        balance: Int
+    ) : this(null, nickname, email, password, balance)
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+        other as Tank
+        if (uid != other.uid) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return (uid ?: -1) as Int
+    }
+}

compose/app/src/main/java/ru/ulstu/is/pmu/student/model/UserTankCrossRef.kt

@@ -0,0 +1,10 @@
+package ru.ulstu.`is`.pmu.student.model
+
+import androidx.room.Entity
+
+//many to many for user and tank
+@Entity(primaryKeys = ["userId", "tankId"])
+data class UserTankCrossRef(
+    val userId: Long,
+    val tankId: Long
+)

compose/app/src/main/java/ru/ulstu/is/pmu/student/model/UserWithTanks.kt

@@ -0,0 +1,16 @@
+package ru.ulstu.`is`.pmu.student.model
+
+import androidx.room.Embedded
+import androidx.room.Junction
+import androidx.room.Relation
+
+//для работы many to many для получения списка танков для пользователя
+data class UserWithTanks(
+    @Embedded val user: User,
+    @Relation(
+        parentColumn = "userId",
+        entityColumn = "tankId",
+        associateBy = Junction(UserTankCrossRef::class)
+    )
+    val tanks: List<Tank>
+)