[doc] add better build instruction for ubuntu and archlinux

README.md

@@ -21,10 +21,25 @@ We are currently working on an MVP for a native GNOME app that only sends files,
 * native Android/iOS/macOS/Windows apps
 
 ## Build
+Archlinux
+=========
 ```
-  cd src
+  pacman -S base-devel libsoup avahi gtk3
+  git clone https://github.com/frac-tion/teleport.git
+  cd teleport/src
   make
+  ./teleport
 ```
+Ubuntu
+======
+```
+  apt install pkg-config libsoup2.4-dev libavahi-client3 libgtk-3-dev
+  git clone https://github.com/frac-tion/teleport.git
+  cd teleport/src
+  make
+  ./teleport
+```
+
 
 ## License
 AGPLv3, because freeeeeeedom