new docs (#525)

* new docs

* moves development docs to dev_docs

dev_docs/Release_Validation_Recipe.md

@@ -0,0 +1,75 @@
+# Pre-release Validation Plan
+_This document contains a general purpose test plan for validating cellxgene prior to release_.
+
+All steps are expected to pass with no errors or malfunctions.   Tester should check:
+* CLI for errors (eg, build error, engine error)
+* Browser console for errors
+* Expected CLI and/or browser UI function
+
+## [Backend Test](#backend-test)
+
+### Getting started build & install validation:
+Goal: validate build, install and example demo correctness, per Getting Started instructions.
+
+1. Clean clone of the cellxgene repo into a local directory
+2. Follow build & install instructions from the Getting Started guide
+    * Confirm no build or install errors
+    * Confirm `cellxgene --help` functions correctly
+3. Follow the example data set demo startup from Getting Started guide and confirm front-end data loads correctly
+4. Confirm all package (and other) version dependencies are correct and match 
+
+### Tabula Muris 
+Goal: basic functional validation of b/e functions using Tabula Muris data and the scanpy engine.
+
+1. Precondition: cellxgene built & installed.
+2. Load the Tabula Muris data set: `cellxgene --title 'T. Muris' scanpy directory-name/`
+3. Verify all metadata selectors display and have correct type/options:
+    * *TODO:* _need list of metadata and their type_
+    * ...
+4. Verify default graph display has expected layout.   _need screen shot of expected layout_
+5. Verify selection controls work as expected:
+    * continuous metadata field
+    * categorical metadata field
+    * graph/lasso select
+6. Verify color by metadata type
+7. Select two cell sets and confirm differential expression compute succeeds
+6. Verify expression scatter plot is correct 
+
+
+## [Front-end Compatibility Test](#frontend-compatability-test)
+Goal: verify front-end UI compatibility with a given browser variant/version/platform.
+
+1. Start back-end on PBM3K data set
+2. Load UI
+3. Verify all major UI modes/functions:
+    * Graph display
+    * Metadata selector display
+    * Title display
+    * Selection - single and multiple fields - correctly display in cluster graph
+    * Regraph & reset function correctly
+    * Differential expression calc & scatter plot display
+    * All graphs maintain consistent selection state
+    * All selection widgets (eg, continuous metadata selector) maintain correct status (consistent with graph displays)
+4. Verify overall performance is reasonable/interactive
+5. Verify no errors on CLI or browser console
+
+
+## [End-to-end Functional Test](#e2e-functional-test)
+Goal: confirm end-to-end functional behavior is as expected.
+
+### ScanPy engine
+
+1. Basic data load and display
+    * ...
+2. Select & multi-select of metadata and coordinates
+    * ...
+3. Color by metadata
+    * ...
+4. Regraph / reset
+    * ...
+5. Differential expression: scatterplot, top-N genes, etc.
+    * ...
+6. Color by expression
+    * ...
+7. Arbitrary gene expression
+    * ...