Merge branch 'master' of https://github.com/ClaytonWWilson/Listify

Lambdas/Lists/Chain/README.md

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+# Chain Module
+Deals with information concerning store chains supported by the product populating and product serving Lambdas.
+
+### ChainGET
+#### Expected request body:
+N/A
+
+#### Expected query parameters:
+  - id
+    - Used for specifying which chain to retrieve
+    - Valid values: -1,1<n<{num_chains}
+    
+#### Inputs and outputs:
+  - id = -1: Returns an array if chainIDs (Integers)
+  - id = 1<n<{num_chains}: Returns a [Chain object](https://github.com/ClaytonWWilson/Listify/blob/master/Lambdas/Lists/Chain/src/Chain.java) for the chain with chainID=id
+