Add installation documentation

docs/INSTALL.MD

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+# Installation
+
+## Rust
+```bash
+# Download & install rust
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+## Comunic Server
+1. Clone the repository
+```bash
+git clone https://gitlab.com/comunic/comunicapiv3
+cd comunicapiv3
+```
+
+2. Build the server
+```bash
+cargo build --release
+```
+
+3. Create & edit custom configuration
+```bash
+cp config.yaml config.private.yaml
+chmod 700 config.private.yaml
+nano config.private.yaml
+```
+
+4. Adapt the following command to test the server: `/home/comunic/comunicapiv3/target/release/comunic_server /home/comunic/comunicapiv3/config.private.yaml`
+
+5. Enable required modules in Apache:
+```bash
+sudo a2enmod proxy_http
+sudo a2enmod proxy_wstunnel
+```
+
+6. Create Apache configuration, save it & restart Apache:
+```conf
+<VirtualHost *:443>
+    ServerName api.communiquons.org
+
+    ServerAdmin webmaster@localhost
+
+    ErrorLog ${APACHE_LOG_DIR}/error.log
+    CustomLog ${APACHE_LOG_DIR}/access.log combined
+
+    # Redirect user web socket
+    RewriteEngine On
+    RewriteCond %{REQUEST_URI} (.*)/ws$    [NC]
+    RewriteRule /ws ws://localhost:3005/ws [P,L]
+
+
+    ProxyPreserveHost On
+    ProxyRequests off
+    AllowEncodedSlashes NoDecode
+    ProxyPass / http://localhost:3005/ nocanon
+    ProxyPassReverse / http://localhost:3005/
+
+    SSLEngine on
+    SSLCertificateFile    /etc/letsencrypt/live/communiquons.org-0001/fullchain.pem
+    SSLCertificateKeyFile  /etc/letsencrypt/live/communiquons.org-0001/privkey.pem
+</VirtualHost>
+```
+
+7. Create systemd configuration (in `/etc/systemd/system/comunic.service`):
+```conf
+[Unit]
+Description=Comunic API Server
+After=syslog.target
+After=network.target
+
+[Service]
+# Modify these two values ​​and uncomment them if you have
+# repos with lots of files and get to HTTP error 500 because of that
+###
+# LimitMEMLOCK=infinity
+# LimitNOFILE=65535
+RestartSec=2s
+Type=simple
+User=comunic
+Group=comunic
+WorkingDirectory=/home/comunic
+ExecStart=/home/comunic/comunicapiv3/target/release/comunic_server /home/comunic/comunicapiv3/config.private.yaml
+Restart=always
+Environment=USER=comunic 
+HOME=/home/comunic
+
+[Install]
+WantedBy=multi-user.target
+```
+
+8. Enable new configuration:
+```bash
+sudo systemctl enable comunic.service
+sudo systemctl start comunic.service
+```