update readme

Author: ernestoarbitrio

README.md

@@ -16,17 +16,65 @@ The GDC API drives the GDC Data and Submission Portals and provides programmatic
 ### Installation
 `pip install gdc-api-wrapper`
 
+## TCGA API Reference
+
 ### Download single file
 ```python
-from gdcapiwrapper.data import Data
+from gdcapiwrapper.tcga import Data
 Data.download(uuid="uuid-file-you-wanna-download", path="/local/path", name="filename")
 ```
 NOTE: `path` and `name` are optional, by default path is your current directory and if name is 
 not provided it will be saved with the UUID as filname.
 
 ### Download multiple files
 ```python
-from gdcapiwrapper.data import Data
-Data.download_multiple(uuid_list=["UUID1", "UUID2", "UUID3"], path="/local/path")
+from gdcapiwrapper.tcga import Data
+response, filename =Data.download_multiple(uuid_list=["UUID1", "UUID2", "UUID3"], path="/local/path")
 ```
 NOTE: `path` is optional, by default path is your current directory.
+
+
+## TCIA API Reference
+
+### Get a list of SOPInstanceUID for a given series
+```python
+from gdcapiwrapper.tcia import Data
+# Example for CSV, HTML, XML
+response, filename = Data.sop_instance_uids(
+                        series_instance_uid="uid.series.instance",
+                        format_="JSON",
+                        path="/local/path", 
+                        name="filename"
+                    )
+# Example for JSON
+response, json = Data.sop_instance_uids(series_instance_uid="uid.series.instance")
+```
+Formats allowed: `["CSV", "HTML", "JSON", "XML"]`, default: `JSON`. When `JSON` is requested the API will not save any
+json file on disk, returns an in memory json object.
+ 
+NOTE: `path` and `name` are optional, by default path is your current directory and if name is 
+not provided it will be saved with the SeriesInstance as filename.
+
+### Download Single DICOM image
+```python
+from gdcapiwrapper.tcia import Data
+response, filename = Data.download_single_image(
+                        series_instance_uid="uid.series.instance",
+                        sop_instance_uid="uid.sop.instance",
+                        path="/local/path",
+                        name="filename.dcm",
+                    )
+```
+NOTE: `path` and `name` are optional, by default path is your current directory and if name is 
+not provided it will be saved with the SOPInstanceUID as filename.
+
+### Download set of images in a zip file 
+```python
+from gdcapiwrapper.tcia import Data
+response, filename = Data.download_series_instance_images(
+                        series_instance_uid="uid.series.instance",
+                        path="/local/path",
+                        name="filename.zip")
+```
+NOTE: `path` and `name` are optional, by default path is your current directory and if name is 
+not provided it will be saved with the SOPInstanceUID as filename.