add document describing idea for MRP

production_scheduling.md

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+Logic to setup production plan, inventory balances, purchases, and shipments
+
+Starting point
+- known balances
+- known available
+- known prod schedule
+- known shipments
+- forecasted orders
+
+Populate
+- forecasted prod schedule
+- forecasted on-hand
+- forecasted available
+- forecasted purchases
+
+Iterate through each calendar day
+1. materialize forecasted purchases
+2. materialize production
+3. materialize shipments
+4. process forecasted order submissions
+    1. check for inventory available
+        1. Yes
+            1. mark unavailable
+        2. No or partial
+            1. mark unavailable any partial
+            2. schedule on next open slot regardless of request date
+                1. raw materials available
+                    1. Yes
+                        1. mark unavailable (at begin prod date?)
+                    2. No
+                        1. mark unavailable any partial (at begin prod date?)
+                        2. schedule a purchase net of lead time
+                2. sub-components available?
+                    1. Yes
+                        1. mark unavialable (at begin prod date?)
+                    2. No
+                        1. mark unavailable any partial (at begin prod date?)
+                        2. schedule on next open slot regardless of request date (return to 4.1.2.2)