update readme

README.md

@@ -1,6 +1,8 @@
 `git-resolve-conflict <strategy> <filename>`
 ===========================================================
 
+> Resolve merge conflict in one file, using given strategy (--ours, --theirs, --union)
+
 Say you have multiple git branches and you want to merge
 between them, and always resolve conflicts **in a particular file** with a **fixed strategy**
 (say `ours`).
@@ -18,6 +20,7 @@ being changed in both branches.
 
 How to easily **resolve the merge conflict** in an **automated manner** (script) in such a situation?
 
+**TL;DR** we need to use [git-merge-file](https://git-scm.com/docs/git-merge-file) but its API is not easy. Hence I wrote a wrapper `./git-resolve-conflict.sh` around it (I used temp files instead of process substitution to make it msys/mingw-friendly). 
 
 The usual suspects
 ==================