Doc: add/update info about templating

Author: jan-warchol

Diff for: manual-installation.md

@@ -5,8 +5,8 @@ Guidelines for creating a selenized theme for your terminal emulator.
 
 Each Selenized variant defines 3 background shades (`bg_*`), 3 content shades
 (`dim_*`, `fg_*`) and 8 accent colors (each with a bright version). This
-document explains which color to use for what. You can find RGB values of the
-colors [here](the-values.md).
+document explains which color to use for what. You can find [RGB values of the
+colors **here**](the-values.md).
 
 
 ### Color mapping
@@ -56,8 +56,20 @@ ANSI palette:
 | 14  | bright cyan    | br_cyan         |
 | 15  | bright white   | fg_1            |
 
+
+### Creating a template
+
+Theme files should be generated from templates (so that it's easy to create
+configs for all selenized variants, and update them whenever colors change).
+
+See
+[`utils/templates/template-test.example.template`](./utils/templates/template-test.example.template)
+for an example template and [`utils/README.md`](./utils/README.md) for
+instructions on how to use templating machinery.
+
 That's it!
 
 Please send me a [pull request](https://github.com/jan-warchol/selenized/pulls)
-with the resulting configuration so that I can make your terminal officially
-supported :-)
+with the resulting configs and template so that I can make your terminal
+officially supported :-)
+

Diff for: utils/README.md

@@ -9,7 +9,7 @@ templates.
 ### Requirements
 
 - [Python](https://www.python.org/) with development files. Python 3.7
-  and 2.7 is known works; 3.5 and 3.6 might work, but nobody tried yet,
+  and 2.7 is known to work; 3.5 and 3.6 might work, but nobody tried yet.
 - [Colormath](https://github.com/gtaylor/python-colormath) Python library.
 
 Example requirements installation for Debian/Ubuntu Linux and Python 2.7:
@@ -27,13 +27,13 @@ Example requirements installation for Debian/Ubuntu Linux and Python 2.7:
 To generate config file, use `evaluate_template.py` script. You need to provide
 it with two arguments: path to the palette module (with the palette you want to
 use) and path to a template config for your terminal. For example, if you
-wanted to generate selenized medium config file for iTerm, you would do it like
+wanted to generate selenized dark config file for iTerm, you would do it like
 this:
 
     selenized/utils$ python evaluate_template.py \
-                         palettes/selenized_medium.py \
+                         palettes/selenized_dark.py \
                          templates/itermcolors.template
-    [...]
+
     Processing templates/itermcolors.template...
     Result written to output/Selenized medium.itermcolors