shopt: add page (#1033)

pages/common/shopt.md

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+# shopt
+
+> Manage Bash shell options: variables (stored in `$BASHOPTS`) that control behavior specific to the Bash shell.
+> Generic POSIX shell variables (stored in `$SHELLOPTS`) are managed with the `set` command instead.
+
+- List of all settable options and whether they are set:
+
+`shopt`
+
+- Set an option:
+
+`shopt -s {{option_name}}`
+
+- Unset an option:
+
+`shopt -u {{option_name}}`
+
+- Print a list of all options and their status formatted as runnable `shopt` commands:
+
+`shopt -p`
+
+- Show help for the command:
+
+`help shopt`