add install readme

README.org

@@ -1 +1,17 @@
 A basic chess program. The goal is not to make it good, but at least to be able to play a full game - Far to be the case !
+
+* Installation:
+** clone repos
+*** user...
+$ git clone https@git.raoult.com:bruno/brchess.git
+or
+$ git clone https@git.raoult.com:bruno/brchess.git
+*** ... or developer
+$ git clone https@git.raoult.com:bruno/brchess.git
+$ cd brchess
+$ git remote add github git@github.com:braoult/brchess.git
+** add "brlib" submodule
+$ git submodule init
+$ git submodule update --remote --merge
+
+* [...] to be completed...