Update README.md

README.md

@@ -1,6 +1,14 @@
 **To execute the shell:**
 
 ```shell
+./output/main
+```
+
+**To Modify and rebuild shell:**
+
+```shell
+sudo apt-get update
+sudo apt-get install cmake
 cmake .
 make
 ./output/main
@@ -25,18 +33,39 @@ c++17 required
 
 <h3>Implemented</h3>
  <ol>
-    <li>All Linux Commands are supported (tell if some commands doesn't work)</li>
+    <li>All Linux Commands are supported.</li>
     <li>Batch Mode done (Use "rsh filename.rsh" \\ Only .rsh files allowed)</li>
     <li>Git Branch, Username, PC name and current directory display during input prompt.</li>
     <li>"exit" can be used to exit the shell and revert to default linux shell</li>
     <li>pipes ('|') and redirections ('<' or '>' or '>>') supported</li>
-    <li>Google a word for its meaning in more than 6 languages</li>
+    <li>"history" command can be used to list all the commands used in current shell session.</li>
  </ol>
 
  <h3>Remaining</h3>
   <ol>
    <li>Aliases not yet implemented.</li>
-   <li>cd is not fully functional.</li>
+   <li>Commands contatining string (" ") may not function properly.</li>
+  </ol>
+
+ <h3>Additional Features</h3>
+
+ <h3>Implemented</h3>
+  <ol>
+    <li>Basic Text editing while entering command is supported.</li>
+    <li>Command History access using &#8593 and &#8595 arrow key.(Limited to current shell session only)</li>
+    <li>Tab Auto-Completion during input is supported.</li>
+    <li>Basic Arithmetic Operation can be performed using "calc [expresssion]".<br />  (Here expression is any mathematical expression without a space)  </li>
+    <li>"google <word_to_search> <optional:lang_code>" can be used to google meaning of any word.<br />
+        (Note: An active Internet Connection is required to run this command.)</li>
+  </ol>
+      
+ <h3>Beginner Shell Tutorial</h3>
+
+ <h3>Implemented</h3>
+  <ol>
+    <li>"tutorial" command be used to run tutorial content and learn about basic shell and git commands inside shell.</li>
+    <li>"tutorial level <level-number>" can be used to access practice levels and find the hidden flag using shell commands.</li>
+    <li>"tutorial level <level-number> password" can be used to submit the hidden flag in grading software and pass that level.</li>
   </ol>
 
 **Errors and Solutions:**