Added descriptions for all cards

Author: hhariri

Building Web Applications with React and Kotlin JS/00_description.md

@@ -1,2 +1,4 @@
 # Building Web Applications with React and Kotlin/JS
 
+Create a React Application using Kotlin/JS and see how you can leverage
+static typing with Kotlin.

Introduction to Coroutines and Channels/00_description.md

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+# Introduction to Coroutines and Channels
+
+Learn about coroutines in Kotlin and how you can communicate between 
+them using channels.

Introduction to Kotlin Multiplatform/00_description.md

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+# Introduction to Kotlin Multiplatform
+
+Learn how to create a server (JVM) and client side (JS) application using Kotlin Multiplatform. 

Introduction to Kotlin Native/00_description.md

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-# Introduction to Kotlin/Native
+# Introduction to Kotlin/Native
+
+Create a simple HTTP client that can run natively on multiple
+platforms using Kotlin/Native and libcurl.
+

Targeting iOS and Android with Kotlin Multiplatform/00_description.md

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+# Targeting iOS and Android with Kotlin Multiplatform
+
+Learn how to create a mobile application that can target both iOS and Android using Kotlin Multiplatform.

The State of Kotlin JS/00_description.md

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-# The State of Kotlin/JS
+# The State of Kotlin/JS
+
+Supplementary materials for the talk "The State of Kotlin/JS" from KotlinConf 2019. You can expect more standalone learning materials regarding Kotlin/JS in early 2020.