DOC: Letsencrypt specific readmes

LetsEncrypt/README.md

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+# Lets Encrypt
+
+- Create one certificate for www and non-www as follows:
+```
+ sudo docker run -it --rm \
+-v /home/jeanclaude/HomeServer/Ssl/etc/letsencrypt:/etc/letsencrypt \
+-v /home/jeanclaude/HomeServer/Ssl/var/lib/letsencrypt:/var/lib/letsencrypt \
+-v ${PWD}/Site:/data/letsencrypt \
+-v /home/jeanclaude/HomeServer/Ssl/var/log/letsencrypt:/var/log/letsencrypt \
+certbot/certbot \
+certonly --webroot \
+--email mail@jeanclaudegraf.ch --agree-tos --no-eff-email \
+--webroot-path=/data/letsencrypt \
+-d www.matrix.jeanclaudegraf.ch -d matrix.jeanclaudegraf.ch
+```