Improve the ReadMe

ReadMe.md

@@ -1,19 +1,48 @@
 Convert FiberWorks dtx handweaving files to WIF 1.1
 
-This is a command-line script. To run it:
+This is a command-line script written in Python. See Installation and Usage for instructions.
 
-`$ ./dtx_to_wif path1 path2 ... --overwrite`
+This software is licensed under the MIT license; see license.text for details.
+
+Installation
+------------
+
+Test if you have Python installed by running your [terminal application](#terminal-applications) and typing `python` at the command prompt. If this runs a Python interpreter and the displayed version is at least 3.6, then you are good to go.
+
+If you don't already have Python installed, or your installed version is too old, download the free installer from python.org and run it. Then repeat the test as above to be sure the installation was successful.
+
+Download this code, e.g. by going to https://github.com/r-owen/dtx_to_wif_converter/releases
+Unpack the results and put the directory (or, if you prefer, just the "dtx_to_wif") somewhere convenient, such as your home directory.
+
+Usage
+-----
+
+Run your [terminal application](#terminal-applications).
+
+Change directory to the directory containing `dtx_to_wif`.
 
-This will recursively scan each provided path (which may be a file or directory) for files whose names end in ".dtx". For each such file it finds, it will write a new WIF file in the same directory, with the standard ".wif" extension, provided such a file does not already exist. You can specify option `--overwrite` to (silently) overwrite existing WIF files.
+Type:
+
+`$ ./dtx_to_wif path1 path2 ...`
+
+where each `path` is the path to a .dtx file or a directory containing .dtx files. On macOS, if you drag a file or folder from Finder onto your Terminal, the path will be typed for you. Windows may well do the same thing with its file browser.
+
+The program will scan each provided directory for files whose names end in ".dtx". This is a recursive search, meaning it looks in all directories inside the provided directory, no matter how deeply nested.
+
+For each ".dtx" file the program finds, it will write a new WIF file in the same directory, with the same name and the ".wif" extension. If such a WIF file already exists, the program will warn you and not replace it. However, if you specify option `--overwrite` the program will overwrite (replace) existing WIF files.
 
 Specify `--help` (or `-h`) to print help.
 
-Known differences from the WIF files that FiberWorks writes:
+Terminal Applications
+---------------------
 
-- If no color information is given, this code writes a 2-element color table, whereas FiberWorks writes a much longer table.
-- The warp/weft color sections specify the color of every end and every pick. By comparison, FiberWorks omits entries when the color is the default.
-- The default color of weft (and possibly warp) yarns will likely not match FiberWorks's WIF files. I have not figured out the algorithm FiberWorks uses to pick a default weft color.
+The standard terminal applications are Terminal for macOS and Windows Terminal for Windows. There are other terminal applications available, but the standard ones will do just fine.
 
-The script is written in Python 3 and uses only standard libraries.
+WIF Details
+-----------
 
-This software is licensed under the MIT license; see license.text for details.
+Known differences from the WIF files that FiberWorks writes:
+
+- If no color information is given, this code writes a color table with only 2 entries. FiberWorks writes a much longer table.
+- The warp/weft color sections specify the color of every end and every pick. FiberWorks omits entries when the color is the default (the `Color` entry in the `[WEFT]` and `[WARP` sections). This means FiberWorks produces a smaller file, but both contain contain equivalent information.
+- The default color of weft (and possibly warp) yarns will probably not be the same as WIF files that WIF writes. This is because I have not figured out the algorithm FiberWorks uses to pick a default weft color. This is also the main reason I chose to list the color of each and every end and pick.