Started work on build guide

docs/build.md

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+# TeraHz build guide
+The recommended way of getting TeraHz is the official SD card image provided
+under the releases tab in the GitHub repository. Installing TeraHz from source
+is a time consuming and painful process, even more so if you don't know what
+you're doing, and whatever you end up building __will not be officially
+supported__ (unless you're a core developer).
+
+With this warning out of the way, let's begin.
+
+## Getting the latest sources
+The most reliable way to get working source code is by cloning the official GitHub
+repository and checking out the `development-working` tag. This tag marks the latest
+confirmed working commit. Building from the master branch is somewhat risky, and
+building from development branches is straight up stupid if you're not a developer.
+
+After cloning and checking out, check the documentation for module dependencies
+and the required version of python.

docs/dependencies.md

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+# TeraHz `development-stable` dependencies
+The current development version of TeraHz has been verified to work with:
+  - Raspbian Stretch (9)
+  - Python 3.6.8 (built from source code and altinstalled)
+  - Module versions (direct `pip3.6 list` output):
+  ```
+    Package         Version  
+    --------------- ---------
+    Click           7.0      
+    Flask           1.0.3    
+    itsdangerous    1.1.0    
+    Jinja2          2.10.1   
+    MarkupSafe      1.1.1    
+    numpy           1.16.4   
+    pandas          0.24.2   
+    pip             18.1     
+    pyserial        3.4      
+    python-dateutil 2.8.0    
+    pytz            2019.1   
+    setuptools      40.6.2   
+    six             1.12.0   
+    smbus           1.1.post2
+    Werkzeug        0.15.4   
+  ```