access-to-data.md

 # Access to data
 
+The CC resource provides a very simple API to query the data within the resource. In brief, the API facilitates the following:
+
+* Given one or more `inchikeys`:
+ * It lists the corresponding `datasets`.
+ * It returns the InChI structure(s).
+ * If a `dataset` is specified, it returns the signatures (`sign*`) or vectorial data (`neig*`, `clus*`, etc.) of choice.
+* Given one or more `datasets`:
+ * It lists the corresponding `inchikeys`.
+ * It returns the signatures (`sign*`) or vectorial data (`neig*`, `clus*`, etc.) of choice.
+ * It deletes the dataset from the resource (might be convenient when we are testing datasets).
+* Given one or more `levels` or `coordinates`:
+ * It lists the corresponding `datasets`.
+ * It indicates the exemplar `dataset(s)`.
+
+## Installation
+
+To install the `chemicalchecker` package, simply do:
+
+
+
+
+## Usage
+
+Let's get started by simply fetching 2D chemical information for a molecule of interest.
+
+```
+import chemicalchecker as cc
+
+ik = "RZVAJINKPMORJF-UHFFFAOYSA-N"
+
+cc.get(inchikey = ik, dataset = "A1.001", type = "sign1")
+```
+
+To directly extract the exemplary signature, we may simply do:
+
+```
+cc.get(inchikey = "ik", dataset = "A1", type = "sign1")
+```
+ 
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