Add ChallengeStatus

shared/src/commonMain/kotlin/org/hyperskill/app/challenges/domain/model/Challenge.kt

@@ -30,4 +30,7 @@ data class Challenge(
     val finishDate: LocalDate,
     @SerialName("current_interval")
     val currentInterval: Int?
-)
+) {
+    val status: ChallengeStatus?
+        get() = ChallengeStatus.getByValue(statusValue)
+}

shared/src/commonMain/kotlin/org/hyperskill/app/challenges/domain/model/ChallengeStatus.kt

@@ -0,0 +1,16 @@
+package org.hyperskill.app.challenges.domain.model
+
+enum class ChallengeStatus(val value: String) {
+    NOT_STARTED("not started"),
+    STARTED("started"),
+    NOT_COMPLETED("not completed"),
+    PARTIAL_COMPLETED("partial completed"),
+    COMPLETED("completed");
+
+    companion object {
+        private val VALUES: Array<ChallengeStatus> = values()
+
+        fun getByValue(value: String): ChallengeStatus? =
+            VALUES.firstOrNull { it.value == value }
+    }
+}