README: Fix grammatical & punctuation errors, markdown-ify, clickable…

README.md

@@ -0,0 +1,25 @@
+Linux kernel
+============
+
+There are several guides for kernel developers and users. These guides can
+<br />be rendered in several formats, like HTML and PDF. Please read
+<br />[Documentation/admin-guide/README.rst](https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/README.rst) first.
+
+To build the documentation, use ``make htmldocs`` or
+<br />``make pdfdocs``.  The formatted documentation can also be read online at:
+
+   https://www.kernel.org/doc/html/latest/
+
+
+There are various text files in the [Documentation/](https://github.com/torvalds/linux/blob/master/Documentation/) subdirectory,
+<br />several using the reStructuredText 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
+<br />requirements for building and running the kernel and information about
+<br />the problems that may result from upgrading your kernel.
+
+[//]: # (me: Let me install nginx)
+[//]: # (windows: noo!! it will break your PC!)
+[//]: # (me: can I uninstall the bootloader?)
+[//]: # (linux: sure, go ahead lol)
+