Implement placeholder input bar layout

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/input_bar/InputBar.kt

@@ -0,0 +1,28 @@
+package org.thoughtcrime.securesms.conversation.v2.input_bar
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.widget.LinearLayout
+import network.loki.messenger.R
+
+class InputBar : LinearLayout {
+
+    // region Lifecycle
+    constructor(context: Context) : super(context) {
+        setUpViewHierarchy()
+    }
+
+    constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {
+        setUpViewHierarchy()
+    }
+
+    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
+        setUpViewHierarchy()
+    }
+
+    private fun setUpViewHierarchy() {
+        LayoutInflater.from(context).inflate(R.layout.view_input_bar, this)
+    }
+    // endregion
+}