Add Debian compilation dependencies

Package compiled on Arch might have too recent packages, but default
packages are too old to even compile on Debian...

README.md

@@ -2,10 +2,30 @@
 
 Wrapper project for element-desktop, element-web, matrix-react-sdk and matrix-js-sdk, in order to build SchildiChat-Desktop.
 
+
+# Debian compilation dependencies
+
+```
+# apt install vim curl git make gcc g++ libsqlcipher-dev pkg-config libsecret-1-dev bsdtar
+# curl -sL https://deb.nodesource.com/setup_14.x | bash -
+# apt update
+# apt install nodejs
+
+# curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+# echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+# apt update
+# apt install yarn
+
+$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+$ echo 'export PATH="$PATH:$HOME/.cargo/bin"' >> .bashrc
+$ source .bashrc
+```
+
 # Initial setup
 
 ```
 git clone --recurse-submodules https://github.com/SpiritCroc/schildichat-desktop.git
+cd schildichat-desktop
 ./setup.sh
 ```