Add newspost about how to use Jekyll for the website

www.freecol.org/_posts/2020-02-09-first-steps-for-contributing-to-freecol-website.md

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+---
+  title: First Steps For Contributing To FreeCol Website
+  author: Sebastian Zhorel
+---
+*Sunday, 2020-07-05:
+This is a repost from the FreeCol forum to preserve this guide. It includes
+a few additional improvements.  
+Many thanks to Blake for initially having me write this, trying everything out
+causing the improvements and encouraging me now to post the news!*
+
+*Stay tuned for the follow-up: **The Hidden Story Of The Website Update!***
+
+
+### How To Use Jekyll For The FreeCol Website
+
+Please, follow these steps! If you don't try it can never work.
+
+I just tried every step on my second computer to make sure it works.
+I'd like to see if you can follow this before I edit it into the manual:
+
+#### Installation
+
+This is done only once:
+- If you are on Windows go to [https://rubyinstaller.org](https://rubyinstaller.org)
+then download the recommended version and install it (the Ruby people really
+made an effort to make that easy, so please try and just use the standard
+options and wait for it to complete -- do **not** try to install Ruby in a path
+with spaces; in the command window which opens for the Devkit install you should
+**only** type `Enter` once at start and once it completed)
+- If you are on Linux use your package manager to install Ruby
+- Open a command line window, type `ruby -v`, type `Enter` and check if it
+successfully outputs the ruby version
+- Type in `gem install jekyll bundler wdm` and `Enter` to install Jekyll;
+it should complete without an error (if not please ask)
+- You could try typing in `jekyll -v` to see if it got installed correctly
+
+#### Use
+
+This is done every time you want to see the effect of your edits:
+- Open a command line window for the `www.freecol.org` directory where
+you put your local clone of the freecol git repository (if you have git
+installed on Windows just find the directory in Windows Explorer and
+right click and choose `Git bash here`; otherwise you would need to navigate
+through `cd ..` and `cd _directoryname_` and show contents using
+`dir` (Windows) or `ls` (Linux) to get to the right directory)
+- If you are inside the `www.freecol.org` directory you just type
+`jekyll serve` to compile the website and start a local server on this
+computer
+- Open your browser and type `127.0.0.1:4000` in the address bar (thats the
+address of this local computer of yours with the port of the local server
+started by above command)
+- Edit the website files as you like (Jekyll automatically recompiles it
+as long as you did not stop it or close the command window), reload (`F5`) in
+browser to see your changes
+- You can stop the local server using `Ctrl+C` to not have it use
+system recources of your computer when you take a break or need a
+long time editing and restart it using same `jekyll serve` command
+- `jekyll build` only compiles the website without starting the local server,
+in case you want to inspect the compilation result inside the `_site` directory
+or upload it to the webserver
+- In case you accidently started `jekyll serve` or `jekyll build` in the
+wrong directory use `jekyll clean` to let it clean up the temporary files
+it created
+
+Please, tell if everything worked!