modify README.md about the repo and update .gitignore to get rid of some temp files

.gitignore

@@ -0,0 +1,2 @@
+tempdirs/yankring_history_v2.txt
+tempdirs/undodir/

README.md

@@ -1,4 +1,7 @@
-# The Ultimate vimrc
+# The Ultimate vimrc of hustcalm forked from amix
+
+Below is the original readme post of amix
+/**********************************************************************/
 
 Over the last 8 years I have used and tweaked Vim. This is my Ultimate vimrc.
 
@@ -299,3 +302,13 @@ Vimscript mappings:
 * [Vim 7.3: Persistent undo and encryption!](http://amix.dk/blog/post/19548#Vim-7-3-Persistent-undo-and-encryption)
 * [Vim tips: Visual Search](http://amix.dk/blog/post/19334#Vim-tips-Visual-Search)
 * [Folding in Vim](http://amix.dk/blog/post/19132#Folding-in-Vim)
+
+/**********************************************************************/
+Above is the original readme post of amix
+
+# My Updates to The Ultimate vimrc
+
+## Add some useful plugins to the repo
+See them in [vim_plugins_src](https://github.com/hustcalm/vimrc/tree/master/vim_plugins_src).And I will give some details about them later. 
+You can also add your own favorite script from [vim-scripts.org](http://vim-scripts.org/) or install from [github](http://github.com/vim-scripts).
+

temp_dirs/yankring_history_v2.txt

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+k,v
+Above is the original readme post of amix,V
+Below ,v
+Below is the original readme post of amix/**********************************************************************/,v
+p,v
 sources_for,V
 我,v