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docs(file-checker): add description of subject

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eslopfer 2 years ago
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      subjects/devops/file-checker/README.md

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## file-checker
### Instructions
In this exercise you will make a script `file-checker.sh` that will check the status of a given file using if statements.
Your script should make the following checks:
- File exists.
- File is readable.
- File is writable.
- File is executable.
It should output the status as in the example in the usage.
You should also handle what to do when no file is provided. The use of `test` command is not allowed for this exercise.
### Usage
```console
$ ./file-checker.sh file.txt
File exists
File is readable
File is not writable
File is not executable
$ ./file-checker.sh
Error: No file provided
$
```
### Hints
[bash conditional expressions](https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html) can be used to solve this exercise.
For example for `script.sh`:
```bash
#!/usr/bin/env bash
if [ -s $1] ; then
echo "File size greater than 0"
fi
```
And its output:
```console
$ ./script.sh file.txt
File size greater than 0
$
```
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