Prepare Python scripts for building for Mac OSX.

This refs #4 and #6.

# Conflicts:
#	macbuild/build4mac.py

macbuild/ReadMe.txt

@@ -1,25 +1,39 @@
-<< Draft Version 0.001>>
+<< Draft Version 0.002>>
 
-This directory "macbuild" contains different files required to build KLayout
-version 0.25 or later for different Max OSX including:
-    * Yosemite    (10.10)
-    * El Capitan  (10.11)
-    * Sierra      (10.12)
-    * High Sierra (10.13)
+1. Introduction:
+    This directory "macbuild" contains different files required to build KLayout
+    version 0.25 or later for different Max OSX including:
+        * Yosemite    (10.10)
+        * El Capitan  (10.11)
+        * Sierra      (10.12)
+        * High Sierra (10.13)
 
-By default, Qt framework is Qt5 from Mac Ports (https://www.macports.org/) which
-is usually located under:
-   /opt/local/libexec/qt5/
+    By default, Qt framework is Qt5 from Mac Ports (https://www.macports.org/) which
+    is usually located under:
+       /opt/local/libexec/qt5/
 
-Also by default, supported script languages, i.e,, Ruby and Python, are those
-standard ones bundled with the OS.
-However, you are able to choose other options like Python from Anaconda.
-
-bla bla bla ...
+    Also by default, supported script languages, i.e, Ruby and Python, are those
+    standard ones bundled with the OS.
+    However, you are able to choose other options like Python from Anaconda.
+        :
+        :
+        :
+        :
 
 
-To use the top script "build4mac.py" make a symbolic link from the parent directory like:
-    build4mac.py -> macbuild/build4mac.py
-then execute the Python script to build with appropriate options if required.
+2. How to use:
+    (1) Make a symbolic link from the parent directory (where 'build.sh' exists) to
+        'build4mac.py', that is,
+            build4mac.py -> macbuild/build4mac.py
+
+    (2) Build KLayout by appropriate options, for example, for debug-build:
+            $ cd /where/'build.sh'/exists
+            $ ./build4mac.py -d
+
+    (3) Confirm successful build.
+
+    (4) Run 'build4mac.py' again with the same options used in (2) with "-y"
+        to deploy executables and libraries under "klayout.app" bundle.
+            $ ./build4mac.py -d -y
 
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