implemented echo func

[ninsid711]

currently it only works for normal inputs like:
echo hello
echo hello sup hi
but not for inputs contained inside double quotes, so that'll be handled after some time but it'll be fixed.
and also env variable can't be defined using this now, so yeah, it's a shalow function for now 😭

[tejas-techstack]

i mean its a very basic one and it works but theres a lot more you have to do
you have to implement all the arguments that echo has as well you can refer than man page for that but yea
ill leave this pr open you can make the changes and merge it later

[tejas-techstack]

do one thing just implement the -n argument for now its pretty simple we can handle other arguments later on