Fixed the README Format.

README.md

@@ -0,0 +1,17 @@
+# Linux kernel
+
+There are several guides for kernel developers and users. These guides can
+be rendered in a number of formats, like HTML and PDF. Please read
+[Documentation/admin-guide/README.rst](https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/README.rst) first.
+
+In order to build the documentation, use ```make htmldocs``` or ```make pdfdocs```.  
+The formatted documentation can also be read online at:
+
+[https://www.kernel.org/doc/html/latest/](https://www.kernel.org/doc/html/latest/)
+
+There are various text files in the [Documentation/](https://github.com/torvalds/linux/tree/master/Documentation) subdirectory,
+several of them using the Restructured Text markup notation.
+
+Please read the [Documentation/process/changes.rst](https://github.com/torvalds/linux/blob/master/Documentation/process/changes.rst) file, as it contains the
+requirements for building and running the kernel, and information about
+the problems which may result by upgrading your kernel.