feat(reminder): create CalendarApi, interface with microservice

reminderData/src/main/kotlin/com/intelligentbackpack/reminderdata/api/CalendarApi.kt

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+package com.intelligentbackpack.reminderdata.api
+
+import calendar.communication.BasicMessage
+import calendar.communication.BooksForLesson
+import calendar.communication.ChangeLessonBookPeriodDate
+import calendar.communication.Lesson
+import calendar.communication.Lessons
+import calendar.communication.Subjects
+import retrofit2.Call
+import retrofit2.http.Body
+import retrofit2.http.GET
+import retrofit2.http.HTTP
+import retrofit2.http.POST
+import retrofit2.http.Query
+
+interface CalendarApi {
+    @GET("/utility/getAllYears/")
+    fun getYears(): Call<BasicMessage>
+
+    @GET("/utility/getAllSubjects/")
+    fun getSubjects(): Call<Subjects>
+
+    @GET("/utility/lessons/Student/")
+    fun getLessonsForStudent(@Query("email") email: String, @Query("year") year: String): Call<Lessons>
+
+    @GET("/utility/lessons/Professor/")
+    suspend fun getLessonsForProfessor(@Query("email") email: String, @Query("year") year: String): Call<Lessons>
+
+    @POST("/utility/booksforLesson/")
+    fun getBooksForLesson(@Body lessons: Lesson): Call<BooksForLesson>
+
+    @HTTP(method = "DELETE", path = "/remove/bookForLesson", hasBody = true)
+    fun deleteReminderForLesson(@Body remainderForLesson: BooksForLesson)
+
+    @POST("/modify/bookForTimePeriod/")
+    fun modifyReminderForLesson(@Body remainderForLesson: ChangeLessonBookPeriodDate)
+}