Added README.md description

README.md

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+# A simple UNIX shell written in C
+
+I created it for personal usage, but decided to upload it into public repo in case if anybody would be interested in it.
+
+Work is still in porgress, buf when you will see a "finished" topic assigned to it, feel free to contribute.
+
+# Supported features
+* Command input with `left` and `right` arrow, `home` and `end` keys navigation and `backspace`, `delete` support
+* Running commands in separate process and termination them with `ctrl+c`
+* `cd` and `exit` builtin commands
+
+# Builtin commands
+* `cd`: changes current working directory to the one specified by user. If no arguments provided, shows error.
+* `exit`: exits shell
+  
+# TODO
+* Pipes and files input/output
+* Replace linux `echo` command with builtin one with support of environmental variables
+* Environmental variables
+* `Ctrl+Z` running programm with `fd`