update read me

README.md

@@ -26,9 +26,13 @@ Create a workspace and checkout ledisdb source
 
     cd src/github.com/siddontang/ledisdb
 
+    #set build and run environment 
+    source dev.sh
+
     make
     make test
 
+
 ## LevelDB support
 
 + Install leveldb and snappy.
@@ -79,6 +83,9 @@ You must known that changing store database runtime is very dangerous, LedisDB w
 
 ## Server Example
     
+    //set run environment if not
+    source dev.sh
+
     ledis-server -config=/etc/ledis.json
 
     //another shell