README: Clarify the Install section.

1. Install libolm
2. Add the possibility to install dependencies via requirements.txt
3. Not modified

README.md

@@ -17,10 +17,26 @@ support is still experimental.
 
 # Installation
 
-Installation is easy.  As your regular user, just run: `make install` in this repository directory.
+1. Install libolm
 
-The following Python modules must also be available on your system:
+    - Ubuntu
+        ```
+        sudo apt-get install libolm-dev
+        ```
 
+    - Debian (see https://git.matrix.org/git/olm)
+
+    - Archlinux based distribution (see https://aur.archlinux.org/packages/libolm/)
+      use your favorite pacman frontend with AUR support (yaourt, yay, pikaur, …)
+
+2. Clone the repo and install dependencies
+    ```
+    git clone https://github.com/poljar/weechat-matrix.git
+    cd weechat-matrix
+    pip install -r requirements.txt
+    ```
+
+    Another option is to install the dependencies manually:
     - pyOpenSSL
     - typing
     - webcolors
@@ -31,6 +47,8 @@ The following Python modules must also be available on your system:
     - logbook
     - pygments
 
+3. As your regular user, just run: `make install` in this repository directory.
+
     Note that weechat only supports Python2 OR Python3, and that setting is
     determined at the time that Weechat is compiled.  Weechat-Matrix can work with
     either Python2 or Python3, but when you install dependencies you will have to