Update 'Readme.md'

Readme.md

@@ -5,11 +5,46 @@ A Python3 urllib3 based interface for communication with the LabKey server. Upda
 Update `network-config-sample.json` with personal information needed to access the site (certificates, keys, username and password)
 When using labkeyInterface, use the updated file as input to labkeyInterface constructor, ie
 ```python
-ifc=labkeyInterface.labkeyInterface('/path/to/network-config.json')
+import labkeyInterface
+net=labkeyInterface.labkeyInterface()
+net.init('/path/to/network-config.json')
 ```
 
 ### Use ###
 `getFile.py` illustrates use to connect to site, collect image and perform image analysis.
+Typically one would do:
+```python
+#net created as above
+import labkeyDatabaseBrowser
+db=labkeyDatabaseBrowser.labkeyDB(net)
+import labkeyFileBrowser
+fb=labkeyFileBrowser.labkeyFileBrowser(net)
+#project='path/to/project/on/Labkey'
+#schema='study'
+#query='queryName'
+ds=db.selectRows(project,schema,query,[])
+for r in ds['rows']:
+    #r is a dictionary with variables named after column names in labkey
+    #for statistics etc. work with variables directly
+    #for files, figure out where files are stored
+    #typically starting with project, 
+    #- a potential subdirectory, 
+    #- a set of directories determined from fields in r
+    #- a file name from specific field in r
+    subdir='preprocessedImages'
+    pathList=[subdir,r['ParticipantId'],r['visitId'],r['fileName']]
+    path='/'.join(pathList)
+    remotePath=fb.formatPathURL(project,path)
+    #where to copy file to, adjust if neccesary
+    localPath=os.path.join(os.path.expanduser('~'),'temp',r['fileName'])
+    fb.readFileToFile(remotePath,localPath)
+    #do something with file
+#end loop
+print('Done')
+```
+
+One can use row data to navigate list of files and/or do statistical analysis of data.
+
 
 ### Generate private key without password