Created SC1004 (markdown)

SC1004.md

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+## This backslash+linefeed is literal. Break outside single quotes if you just want to break the line.
+
+### Problematic code:
+
+```sh
+var='This is long \
+piece of text'
+```
+
+### Correct code:
+
+```sh
+var='This is a long '\
+'piece of text'
+```
+### Rationale:
+
+You have a single quoted string containing a backslash followed by a linefeed (newline). Unlike double quotes or unquoted strings, this has no special meaning. The string will contain a literal backslash and a linefeed.
+
+If you wanted to break the line but not add a linefeed to the string, stop the single quote, break the line, and reopen it. This is demonstrated in the correct code.
+
+If you wanted to break the line and also include the linefeed as a literal, you don't need a backslash:
+
+```
+var='This is a multi-line string
+with an embedded linefeed'
+```
+
+
+### Exceptions:
+
+If you do want a string containing a literal backslash+linefeed combo, such as with `sed`, you can [[ignore]] this warning.