add: technical stack

lib/model/technical_stack/language.dart

@@ -0,0 +1,5 @@
+// TODO: 言語増やす
+enum Language {
+  Swift,
+  Kotlin,
+}

lib/model/technical_stack/proficiency.dart

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+// TODO: できるできないとかを増やす
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+enum Proficiency {
+  @JsonValue('GOOD')
+  Good,
+  @JsonValue('BAD')
+  Bad
+}

lib/model/technical_stack/stack.dart

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+// TODO: 増やす
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+enum Stack {
+  @JsonValue('IOS')
+  iOS,
+  @JsonValue('ANDROID')
+  Android,
+  @JsonValue('Serverside')
+  Serverside,
+}

lib/model/technical_stack/technical_stack.dart

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+import 'package:flutter/foundation.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:morning_weakers/model/technical_stack/language.dart';
+import 'package:morning_weakers/model/technical_stack/proficiency.dart';
+import 'package:morning_weakers/model/technical_stack/stack.dart';
+
+part 'technical_stack.freezed.dart';
+
+part 'technical_stack.g.dart';
+
+@freezed
+abstract class TechnicalStack with _$TechnicalStack {
+  const factory TechnicalStack({
+    @required String id,
+    @required Stack stack,
+    List<Language> language,
+    @required Proficiency proficiency,
+    int priority,
+  }) = _TechnicalStack;
+
+  factory TechnicalStack.fromJson(Map<String, dynamic> json) => _$TechnicalStackFromJson(json);
+}