cash alternative shell added

cash/.package

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+{
+	title = 'ComputerCraft Advanced Shell',
+	repository = 'kepler155c/opus-apps/{{OPUS_BRANCH}}/cash',
+	description = [[A Bourne-compatible shell for ComputerCraft.
+
+Features
+Bash/sh-style command line
+Tab completion (defaulting to file names where not supported)
+Customizable prompts (including ANSI support)
+Local & environment variables
+Argument quoting
+Multiple commands on one line with semicolons
+Many built-in functions (including in-line Lua commands)
+Arithmetic expansion
+If, while, for statements
+Function support
+Shell scripting/shebangs
+Background jobs
+rc files
+Restorable history
+Partial CCKernel2 support
+Full compatibility with CraftOS shell.lua]],
+	license = 'MIT',
+	install = [[
+		require('opus.alternate').set('shell', 'packages/cash/cash.lua')
+	]],
+	uninstall = [[
+		require('opus.alternate').remove('shell', 'packages/cash/cash.lua')
+	]],
+}

cash/etc/apps.db

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+{
+	[ "a3c2cb0e2228250d98c481128f6837ef93111d73" ] = {
+		title = "MBS",
+		category = "Apps",
+		run = ".mbs/bin/shell.lua",
+	},
+}

cash/etc/fstab

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+packages/cash/cash.lua urlfs https://raw.githubusercontent.com/MCJack123/cash/master/cash.lua