Created SC1012 (markdown)

SC1012.md

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+## `\t` is just literal `t` here. For tab, use `"$(printf '\t')"` instead.
+
+### Problematic code:
+
+```sh
+# Want tab
+var=foo\tbar
+```
+
+or
+
+```sh
+# Want linefeed
+var=foo\nbar
+```
+
+### Correct code:
+
+```sh
+var="foo$(printf '\t')bar"  # As suggested in warning
+var="$(printf 'foo\tbar')"  # Equivalent alternative
+```
+
+or
+```sh
+# Literal, quoted linefeed
+line="foo
+bar"
+```
+### Rationale:
+
+ShellCheck has found a `\t`, `\n` or `\r` in a context where they just become regular letter `t`, `n` or `r`. Most likely, it was intended as a tab, linefeed or carriage return.
+
+To generate such characters (plus other less common ones including `\a`, `\f` and octal escapes) , use `printf` as in the example. The exception is for linefeeds that would be stripped by command substitution; in these cases, use a literal quoted linefeed instead.
+
+Other characters like `\z` generate a [[SC1001]] info message, as the intent is less certain.
+
+### Exceptions:
+
+None.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!