- Added loading instructions for the latest development version in README.md.

Author: mumez

README.md

@@ -7,3 +7,27 @@ We are moving from [Google Code site](http://code.google.com/p/messagepack-st/).
 
 Currently, we have just put a [Cypress](https://github.com/CampSmalltalk/Cypress/blob/master/README.md)-based repository for the neutral accesses from various Smalltalk dialects.
 
+
+
+### Loading the latest development version
+
+#### Squeak
+```Smalltalk
+Installer squeaksource
+    project: 'MessagePack';
+    install: 'ConfigurationOfMessagePack'. 
+(Smalltalk at: #ConfigurationOfMessagePack) project development load
+```
+
+#### Pharo
+```Smalltalk
+Gofer it
+    smalltalkhubUser: 'MasashiUmezawa' project: 'MessagePack';
+    configuration;
+    load.
+(Smalltalk at: #ConfigurationOfMessagePack) project development load
+```
+
+You might need ```MpTypeMapper initializeAll ``` on new encoder/decoder-related updates.
+
+