Add new snowblock for Timewarrior

Created a new snowblock for Timewarrior (1) including

* the `timewarrior.cfg` configuration (2) files for the `igloo` and
  `archbook` hosts
* a Nord (3) based color theme (4) to be imported in `timewarrior.cfg`

> Content

>> Reports

The default `day` reports should include the month name and week number.

> Configuration

>> Core Plugins

>>> `clean`

* `~`
* `~/.timewarrior`

>>> `link`

* "archbook":
  * `timewarrior.cfg.archbook` => `~/.timewarrior/timewarrior.cfg`
  * `nord.theme` => `~/.timewarrior/nord.theme`
* "igloo":
  * `timewarrior.cfg.igloo` => `~/.timewarrior/timewarrior.cfg`
  * `nord.theme` => `~/.timewarrior/nord.theme`

References:

  (1) https://timewarrior.net
  (2) https://taskwarrior.org/docs/timewarrior/configuration.html
  (3) https://arcticicestudio.github.io/nord
  (4) https://taskwarrior.org/docs/timewarrior/themes.html

Closes GH-109

snowblocks/timewarrior/nord.theme

@@ -0,0 +1,25 @@
+# Copyright (c) 2016-present Arctic Ice Studio <[email protected]>
+# Copyright (c) 2016-present Sven Greb <[email protected]>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://taskwarrior.org/docs/timewarrior/themes.html
+#   timew(1)
+
+define theme:
+  description = "An arctic, north-bluish clean and elegant Timewarrior theme."
+  colors:
+    exclusion = "bold black"
+    today = "cyan"
+    holiday = "bold blue on white"
+    label = "bold white on black"
+    ids = "bold black on cyan"
+    debug = "magenta"
+
+  # Rotating color palette for tags.
+  palette:
+    color01 = "bold black on cyan"
+    color02 = "bold black on bright cyan"
+    color03 = "bold black on blue"

snowblocks/timewarrior/snowblock.json

@@ -0,0 +1,28 @@
+[
+  {
+    "clean": [
+      "~",
+      "~/.timewarrior"
+    ]
+  },
+  {
+    "link": {
+      "~/.timewarrior/timewarrior.cfg": {
+        "create": true,
+        "force": true,
+        "hosts": {
+          "archbook": "timewarrior.cfg.archbook",
+          "igloo": "timewarrior.cfg.igloo"
+        }
+      },
+      "~/.timewarrior/nord.theme": {
+        "create": true,
+        "force": true,
+        "hosts": {
+          "archbook": "nord.theme",
+          "igloo": "nord.theme"
+        }
+      }
+    }
+  }
+]

snowblocks/timewarrior/timewarrior.cfg.archbook

@@ -0,0 +1,24 @@
+# Copyright (c) 2016-present Arctic Ice Studio <[email protected]>
+# Copyright (c) 2016-present Sven Greb <[email protected]>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://taskwarrior.org/docs/timewarrior
+#   timew(1)
+
+#+----+
+#+ UI +
+#+----+
+import /home/sgreb/.timewarrior/nord.theme
+color = true
+
+#+---------+
+#+ Reports +
+#+---------+
+define reports:
+  day:
+    lines = 10
+    month = true
+    week = true

snowblocks/timewarrior/timewarrior.cfg.igloo

@@ -0,0 +1,24 @@
+# Copyright (c) 2016-present Arctic Ice Studio <[email protected]>
+# Copyright (c) 2016-present Sven Greb <[email protected]>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://taskwarrior.org/docs/timewarrior
+#   timew(1)
+
+#+----+
+#+ UI +
+#+----+
+import /home/arcticicestudio/.timewarrior/nord.theme
+color = true
+
+#+---------+
+#+ Reports +
+#+---------+
+define reports:
+  day:
+    lines = 10
+    month = true
+    week = true