feat(strange-files): add subject, test and solution for new a exercise

sh/tests/solutions/"\?$*'First_file'*$?\"

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+Random text inside!

sh/tests/strange-files_test.sh

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+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+diff student/\"\\?\$*\'First_file\'*\$?\\\" solutions/\"\\?\$*\'First_file\'*\$?\\\"

subjects/strange-files/README.md

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+## Strange Files
+
+We come across files and folders name very regularly. In most of the cases file/folder names are related to the content of the file/folder and starts with numbers or letters. Alpha-Numeric file name are pretty common and very widely used, but this is not the case when we have to deal with file/folder name that has special characters in them.
+
+Example of most common file names are:
+
+```console
+something.txt
+alphanum21.txt
+674659.txt
+```
+
+Examples of file names that have special characters:
+
+```console
+#121day.txt
+some/file#.txt
+*File$*.txt
+```
+
+When You create a file with some special character, you will need to `escape` those special characters in order to create that file.
+
+A non-quoted backslash `\` is the escape character. The backslash `\` preceding a character tells the shell to interpret that special character literally.
+
+Example:
+
+If you want to create a file named `foo!\.txt` You have to escape the characters like so:
+
+```console
+User-> code foo\!\\.txt
+```
+
+### Instructions
+
+Create a file `"\?$*'First_file'*$?\"` that will contain `Random text inside!` and **nothing else**.
+
+### Usage
+
+```console
+User-> ls | cat -e
+"\?$*'First_file'*$?\"$
+User->
+```