Add LFSA and en PSKOV

lfsa/en/index.md

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+Title: Index
+Date: 2019-05-30 00:00
+Category: Page
+Slug: index
+Lang: en
+
+## Overview
+
+Local File System Access (LFSA) is:
+
+* a tiny web server to allow client side JS access to local file system
+* a buildling block for Client Side Web Apps (CSWA)
+* a single Python file
+
+## CSWA
+
+Client Side Web Apps run solely on your device, they are not related to cloud solutions in any way: nobody can pull the plug on you.
+CSWAs use LFSA to keep data at your hard drive, so you have complete control of your data.
+
+[PSKOV][pskov] static site generator is the first CSWA to use LFSA.
+
+## Install
+
+If you use Linux or macOS released after 2005 (yes, 2005), you only need to [download lfsa-201905.py][lfsa-local].
+
+If you use Windows 2000 or newer (excluding Windows ME), you need to:
+
+* [download][python] and install Python 2.3 or newer
+* [download lfsa-201905.py][lfsa-local]
+
+## Run
+
+If you use Linux or macOS, run LFSA in Terminal this way:
+
+```
+/path/to/lfsa-201905.py /path/to/dir
+```
+
+Here's how it looks like on macOS Mojave:
+
+![LFSA on macOS Mojave][lfsa-on-macos]
+
+If you use Windows, run LFSA in [CMD][cmd] this way:
+
+```
+C:/path/to/Python/installation/python.exe C:/path/to/lfsa-201905.py C:/path/to/dir
+```
+
+Here's how it looks like on Windows 2000:
+
+![LFSA on Windows 2000][lfsa-on-windows]
+
+## Durability
+
+As you noticed, LFSA can run on really old operating systems dating back to 2000. That's intentional: we care about users, so we want to cover as many users as possible.
+
+[pskov]: http://opengamestudio.org/pskov
+[lfsa-local]: ../lfsa-201905.py
+[python]: https://www.python.org/downloads/windows/
+[cmd]: https://en.wikipedia.org/wiki/Cmd.exe
+[lfsa-on-macos]: ../img/lfsa-on-macos.png
+[lfsa-on-windows]: ../img/lfsa-on-windows.png