docs: Importing initial set of library documentation from wiki

To build documentation, doxygen (+graphviz dot) and sphinx-build are
required.  Manpages are build and installed during `./waf build` stage
if sphinx-build is present.

Documentation can be build using the following commands:

    # Full set of documentation (tutorials + API) in build/docs
    ./waf docs

    # Only tutorials in `build/docs`
    ./waf sphinx

    # Only API docs in `build/docs/doxygen`
    ./waf doxgyen

Change-Id: I4c08be08ca3e22068db54584f99467aa6cf38d04
Refs: #1462
diff --git a/docs/named_data_theme/static/default.css_t b/docs/named_data_theme/static/default.css_t
new file mode 100644
index 0000000..b582768
--- /dev/null
+++ b/docs/named_data_theme/static/default.css_t
@@ -0,0 +1,14 @@
+@import url("agogo.css");
+
+pre {
+    padding: 10px;
+    background-color: #fafafa;
+    color: #222;
+    line-height: 1.2em;
+    border: 2px solid #C6C9CB;
+    font-size: 1.1em;
+    /* margin: 1.5em 0 1.5em 0; */
+    margin: 0;
+    border-right-style: none;
+    border-left-style: none;
+}