Update Readme.

Include clarifications about installation from @Airwan.

Fixes https://github.com/lifepillar/vim-solarized8/issues/91.

Readme.md

@@ -18,13 +18,15 @@ Instead, this color scheme works **out of the box everywhere**. For the best
 experience, you need:
 
 - Vim ≥7.4.1799, or NeoVim, with `termguicolors` set, **and**
-- [a true-color enabled terminal](https://gist.github.com/XVilka/8346728).
+- a terminal supporting millions of colors (but see below for workarounds).
 
-Solarized 8 also works in any GUI version of Vim: no configuration is necessary.<sup>*</sup>
+Solarized 8 also works in any GUI version of Vim: no configuration is
+necessary.<sup>*</sup>
 
 <sup>*</sup> [VimR](https://github.com/qvacua/vimr) users must set
 `termguicolors` before loading the color scheme.
 
+
 ## But, my terminal has only 256 colors!
 
 For terminals not supporting true colors, Solarized 8 will fall back to use an
@@ -42,19 +44,28 @@ If you do not like this approximation, to get exact colors with such terminals
 you have two possibilities:
 
 1. Modify some of your terminal colors in the range 16–255 to match Solarized
-   palette. For this purpose, you may run `scripts/solarized8.sh`; no setting is
-   needed in Vim. Note, however, that this is not supported by all terminals
-   (e.g., in macOS's Terminal.app this approach does not work: the script has no
-   effect).
+   palette. For this purpose, you may run (*not* source!)
+   `scripts/solarized8.sh`; no setting is needed in Vim. For instance, if you
+   are using Bash, put this in `.bashrc`:
+
+   ```sh
+   sh /path/to/scripts/solarized.sh
+   ```
+
+   **Note:** this method is supported only by some, but not all, terminals. For
+   instance, in Apple's Terminal.app, running `solarized.sh` has no effect.
 
 2. Set your terminal's 16 ANSI colors (the colors in the range 0–15) to the
-   Solarized palette and `set t_Co=16` in Vim (or `let g:solarized_use16=1`). Be
-   aware that, if you force the usage of your terminal colors, but your terminal
-   is not configured with the Solarized palette, your colors will be completely
-   off.
+   Solarized palette (how to do that depends on the terminal) *and* `set
+   t_Co=16` in Vim (or `let g:solarized_use16=1`) to instruct Vim to use your
+   terminal's colors. Be aware that, if you force the use of your terminal
+   colors in Vim with any of these settings, but your terminal is not
+   configured to use the Solarized palette, your colors will be completely off!
+
+**Note:** whatever method you choose, keep in mind that if your terminal does
+not support millions of colors, you must *not* set `termguicolors` (i.e., make
+sure that `set termguicolors?` outputs `notermguicolors`).
 
-Finally, if your terminal does not support true colors, you must *not* set
-`termguicolors`.
 
 ## What if I happen to work on vt100 or similar?
 
@@ -75,9 +86,21 @@ recommend that you use them. Just clone this repo inside `pack/*/opt`, e.g.:
     git clone https://github.com/lifepillar/vim-solarized8.git \
         ~/.vim/pack/themes/opt/solarized8
 
-Otherwise, use your favourite installation method.
+Then, to load the color scheme, put a line like the following in your `vimrc`:
 
-There are actually four optimized<sup>*</sup> color schemes:
+```vim
+colorscheme solarized8
+```
+
+If you opt to use some Vim plugin manager instead, a line like the following
+should be added to your `vimrc`, rather than the above, for the color scheme to
+be loaded correctly:
+
+```vim
+autocmd vimenter * ++nested colorscheme solarized8
+```
+
+There are actually four optimized<sup>*</sup> color schemes you may load:
 
 - `solarized8_high`: high-contrast variant (screenshow below, first column);
 - `solarized8`: the default Solarized theme (screenshot below, second column);