add readme

python/README.md

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+# PyOntoenv
+
+## Installation
+
+`pip install pyontoenv`
+
+## Usage
+
+```python
+from ontoenv import Config, OntoEnv
+from rdflib import Graph
+
+cfg = Config(["../brick"], strict=False, offline=True)
+
+# make environment
+env = OntoEnv(cfg)
+
+g = Graph()
+# get the transitive owl:imports closure into 'g'
+env.get_closure("https://brickschema.org/schema/1.4-rc1/Brick", g)
+
+brick = Graph()
+brick.parse("Brick.ttl", format="turtle")
+# transitively import dependencies into the 'brick' graph, using the owl:imports declarations
+env.import_dependencies(brick)
+
+# pull Brick graph out of environment
+brick = env.get_graph("https://brickschema.org/schema/1.4-rc1/Brick")
+
+# import graphs by name
+env.import_graph(brick, "https://w3id.org/rec")
+```