Added basic Transmitter apiService implementation with suspend functions

app/src/main/java/com/rtbishop/lookingsat/api/TransmitterApi.kt

@@ -1,10 +1,22 @@
 package com.rtbishop.lookingsat.api
 
 import com.rtbishop.lookingsat.repo.Transmitter
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
 import retrofit2.http.GET
 
 interface TransmitterApi {
 
     @GET("transmitters/?alive=true")
     suspend fun getTransmitterList(): List<Transmitter>
+
+    companion object {
+        operator fun invoke(): TransmitterApi {
+            return Retrofit.Builder()
+                .baseUrl("https://db.satnogs.org/api/")
+                .addConverterFactory(GsonConverterFactory.create())
+                .build()
+                .create(TransmitterApi::class.java)
+        }
+    }
 }

app/src/main/java/com/rtbishop/lookingsat/api/TransmitterService.kt

@@ -1,3 +1,14 @@
 package com.rtbishop.lookingsat.api
 
-class TransmitterService
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.rtbishop.lookingsat.repo.Transmitter
+
+class TransmitterService(private val transmitterApi: TransmitterApi) {
+    private val _transmittersList = MutableLiveData<List<Transmitter>>()
+    val transmittersList: LiveData<List<Transmitter>> = _transmittersList
+
+    suspend fun fetchTransmitters() {
+        _transmittersList.postValue(transmitterApi.getTransmitterList())
+    }
+}