blog: add when then zen post draft

blog/when-then-zen-2018-03-30.markdown

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+---
+date: 2018-03-30
+title: When Then Zen
+---
+
+# When Then Zen
+
+- Overall summary of the project
+  - goals
+  - explanation of method of teaching
+  - contextual/terminology dump
+- In-depth explanation of the anapana feature
+  - break down the parts
+    - header
+    - background
+    - mindfulness of breathing
+    - attention drifts away from mindfulness of breathing
+    - mindfulness of unconscious breathing
+    - meditation session
+    - imagery during breathing
+- Sneak peek of in-progress features