Update README

README

-NOTE: we have stopped maintaining the x86 version of xv6, and switched
-our efforts to the RISC-V version
-(https://github.com/mit-pdos/xv6-riscv.git)
-
-xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix
-Version 6 (v6).  xv6 loosely follows the structure and style of v6,
-but is implemented for a modern x86-based multiprocessor using ANSI C.
-
-ACKNOWLEDGMENTS
-
-xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer
-to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14,
-2000)). See also https://pdos.csail.mit.edu/6.828/, which
-provides pointers to on-line resources for v6.
-
-xv6 borrows code from the following sources:
-    JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and others)
-    Plan 9 (entryother.S, mp.h, mp.c, lapic.c)
-    FreeBSD (ioapic.c)
-    NetBSD (console.c)
-
-The following people have made contributions: Russ Cox (context switching,
-locking), Cliff Frey (MP), Xiao Yu (MP), Nickolai Zeldovich, and Austin
-Clements.
-
-We are also grateful for the bug reports and patches contributed by Silas
-Boyd-Wickizer, Anton Burtsev, Cody Cutler, Mike CAT, Tej Chajed, eyalz800,
-Nelson Elhage, Saar Ettinger, Alice Ferrazzi, Nathaniel Filardo, Peter
-Froehlich, Yakir Goaron,Shivam Handa, Bryan Henry, Jim Huang, Alexander
-Kapshuk, Anders Kaseorg, kehao95, Wolfgang Keller, Eddie Kohler, Austin
-Liew, Imbar Marinescu, Yandong Mao, Matan Shabtay, Hitoshi Mitake, Carmi
-Merimovich, Mark Morrissey, mtasm, Joel Nider, Greg Price, Ayan Shafqat,
-Eldar Sehayek, Yongming Shen, Cam Tenny, tyfkda, Rafael Ubal, Warren
-Toomey, Stephen Tu, Pablo Ventura, Xi Wang, Keiichi Watanabe, Nicolas
-Wolovick, wxdao, Grant Wu, Jindong Zhang, Icenowy Zheng, and Zou Chang Wei.
-
-The code in the files that constitute xv6 is
-Copyright 2006-2018 Frans Kaashoek, Robert Morris, and Russ Cox.
-
-ERROR REPORTS
-
-We don't process error reports (see note on top of this file).
-
-BUILDING AND RUNNING XV6
-
-To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run
-"make". On non-x86 or non-ELF machines (like OS X, even on x86), you
-will need to install a cross-compiler gcc suite capable of producing
-x86 ELF binaries (see https://pdos.csail.mit.edu/6.828/).
-Then run "make TOOLPREFIX=i386-jos-elf-". Now install the QEMU PC
-simulator and run "make qemu".
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+Steps to run the shell
+ 
+Run the virtual machine using ‘make qemu-nox’ or ‘make qemu’
+Run the shell by entering “shell”
+
+Commands Supported:
+ls
+cat
+grep
+echo
+wc
+
+Features provided
+Pipe (|)
+Input Redirection (>)
+Parallel Execution (;)
+Successive Execution (&&, ||)
+
+Any commands supported can be used with any feature supported.
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