Adjust readme

README.md

@@ -1,23 +1,30 @@
 1. Checkout from repository:
 
-      [shell] cd /home/user/git
-      [shell] git clone https://github.com/gsi-ee/dabc.git
+~~~{shell}
+   [shell] cd /home/user/git
+   [shell] git clone https://github.com/gsi-ee/dabc.git
+~~~
 
 2. Compile with cmake
 
-     [shell] mkdir build
-     [shell] cd build
-     [shell] cmake /home/user/git/dabc
-     [shell] make -j
+~~~{shell}
+   [shell] mkdir build
+   [shell] cd build
+   [shell] cmake /home/user/git/dabc
+   [shell] make -j
+~~~
 
    One could switch on/off different plugins calling `cmake -Dverbs=OFF`
 
 3. Install with cmake
 
-      [shell] mkdir -p /home/user/soft/dabc
-      [shell] cmake /home/user/soft/dabc -DCMAKE_INSTALL_PREFIX=/home/user/soft/dabc
-      [shell] make -j
-      [shell] cmake --install .
+~~~{shell}
+   [shell] mkdir -p /home/user/soft/dabc
+   [shell] cmake /home/user/soft/dabc -DCMAKE_INSTALL_PREFIX=/home/user/soft/dabc
+   [shell] make -j
+   [shell] cmake --install .
+~~~
+
 
 4. After successful compilation "dabclogin" script will be generated,
    which should be called like ". dabclogin" before dabc can be used