Merge pull request #7 from perrylets/doc-comments

Add missing doc comments and update README

CommandExec/CommandUtils.cs

@@ -17,7 +17,15 @@ public static Command Shell(params string[] args)
       Command shell = new Command(shellCommand).AddArg(shellArg);
       return shell.AddArg($"\"{string.Join(" ", args).Replace("\"", "\\\"")}");
     }
-
+    /// <summary>
+    /// Checks if a command exists.
+    /// </summary>
+    /// <remarks>
+    /// This method will check for both shell commands and executable files.
+    /// There's a chance that the command exists, but needs to be executed through the shell.
+    /// </remarks>
+    /// <param name="command">The command to check</param>
+    /// <returns>Whether the command exists or not.</returns>
     public static bool Exists(string command)
     {
       Command cmd;

README.md

@@ -8,15 +8,16 @@ for some reason.)
 
 ```cs
 using CommandExec;
-// Initializing the Command class. Check the wiki (WIP) for more options.
-Command dotnet = new Command("dotnet") { "--help" };
-dotnet.Run(); // Runs "dotnet --help".
+
+// Initializing the Command class. Check the wiki (TBD) for more options.
+Command dotnet = new Command("dotnet") { "build", "--help" };
+dotnet.Run(); // Runs "dotnet build --help" synchronously.
 Task dotnetTask = dotnet.RunAsync(); // Runs asynchronously.
 Console.WriteLine("Dotnet help running...");
 await dotnetTask;
 
-Command shell = Command.Shell("dotnet", "--help"); // Creates the shell command. PowerShell on Windows, BASH on Linux/macOS.
+Command shell = CommandUtils.Shell("echo", "Hello world!"); // Creates the shell command. PowerShell on Windows, /bin/sh on UNIX-like systems.
 shell.Run(); // Passing args with `Run` for shell commands is not recommended.
 ```
 
-Check more information about the `Command` class in the [Wiki (WIP)](https://github.com/perrylets/CommandExec/wiki) or the doc comments.
+Check more information about the `Command` class in the [Wiki (TBD)](https://github.com/perrylets/CommandExec/wiki) or the doc comments.