Add extra package docs

convex-core/src/main/java/convex/core/cvm/package-info.java

@@ -0,0 +1,5 @@
+/**
+ * Core CVM implementation. The CVM implements the Convex state transition function when
+ * transactions are executed on the Convex network to modify the global state
+ */
+package convex.core.cvm;

convex-core/src/main/java/convex/core/data/package-info.java

@@ -1,5 +1,7 @@
 /**
  * Data structures and algorithms, including a complete set of classes
  * required to implement immutable, decentralised data objects.
+ * 
+ * Supports the full set of CAD3 objects and encodings.
  */
 package convex.core.data;

convex-core/src/main/java/convex/core/lang/package-info.java

@@ -1,4 +1,4 @@
 /**
- * Core CVM implementation
+ * Core CVM language implementation for Convex Lisp and associated runtime functions
  */
 package convex.core.lang;