Improve README for developer

Author: ngocdaothanh

dev/README.rst

@@ -1,4 +1,7 @@
-zip directory is the directory that will be zipped when Scalive is released.
+zip directory
+-------------
+
+This is the directory that will be zipped when Scalive is released.
 
 ::
 
@@ -20,3 +23,20 @@ While developing:
 * Run ``sbt package`` to create/update scalive.jar
 * Add missing JARs as above
 * Run ``scalive`` to test
+
+Control flow
+------------
+
+::
+
+  AgentLoader ----- attaches Agent ---------------> Target process
+                    passes:                         * Agent loads Server
+                    * TCP port                      * Server listens on the
+                    * jarpaths                        specified TCP port
+
+::
+
+  AgentLoader ----- Client connects to the port --> Target process
+                                                    * Server loads Repl
+              ----- Keyboard input              -->
+              <---- Repl output                 ---