readme: add few backticks

[t-h2o]

README: add a few backticks

I had backtick to:

• path beginning by a dollar

  - The $PATH/of
  + The `$PATH/of`

• extension name

  - The .pdf
  + The `.pdf`

How

I create a perl script

#!/usr/bin/perl
use strict;
use warnings;

my @extensions = ("jpg", "gif", "mp4", "svg", "png", "txt", "pdf", "doc", "mp3");

my $readme = "README.md";
my $readmeUpdate = "README.md.new";
my $scopeCode = 0;

open(my $in, "<", $readme) || die "Can't open $readme $!";
open(my $out, ">", $readmeUpdate) || die "Can't open $readmeUpdate $!";

while (<$in>)
{
  # check if we are in a code scope
  if (/```/)
  {
    if ($scopeCode == 0)
    {
      $scopeCode = 1;
    }
    else
    {
      $scopeCode = 0;
    }
  }

  if ($scopeCode == 0)
  {
    # add backtick to each path beginning by a dollar
    if (/\$\w+/)
    {
      s/( |^)(\$[^\s]+)(\.( |$))/$1`$2`$3/g
    }

    # add backtick to each extensions types
    foreach my $extension (@extensions)
    {
      s/( |^)(\.$extension)/$1`$2`/g
    }

    # add backtick to each command flag
    # WIP
    # TODO
    # ignore if the flag is already between backtick
    # s/( |^|\()(\-+(\w|-)+)/$1`$2`/g
  }

  print $out $_;
}

system("mv", $readmeUpdate, $readme);

close $in;
close $out;

[8go]

@t-h2o, thank you very much for your PR :clap: :clap: