Linkify community and user names

This commit makes user and community names clickable in post/comments. Closes #71?

app/build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
 }
 
 android {
@@ -34,6 +35,11 @@ android {
             versionNameSuffix ' (DEBUG)'
         }
     }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_11
         targetCompatibility JavaVersion.VERSION_11