add readme docs

Author: katzy687

packaging-api-samples/update-services/readme.MD

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+# Update VLAN Services
+This script is utility script to update VLAN ID attribute on services in existing blueprints
+
+
+### Usage
+- install all dependencies in requirements.txt (note that quali-utils packaging api is hosted in download center)
+- add credentials to credentials.py
+- Run cli.py, passing in target VLAN service, existing vlan id, and the new desired vlan id
+
+Sample Command
+```commandline
+python .\cli.py "VLAN Manual" 129 169
+```
+
+Sample output
+```commandline
+Starting Flow. Changing service 'VLAN Manual' VLAN 129 --> 169
+starting blueprint search
+System Blueprint Count: 148
+found target blueprint vlan dev
+Target blueprints found: 1
+search done after 17 seconds
+processing blueprint vlan dev
+['C:\\Users\\natti.k\\code\\quali\\venvs\\cloudshell-api-script-samples\\PY39_cloudshell\\lib\\site-packages\\quali_utils\\QualiSystems.Packaging.exe', 'GetTopologyNames', '--packagepath', 'vlan dev.zip']
+['C:\\Users\\natti.k\\code\\quali\\venvs\\cloudshell-api-script-samples\\PY39_cloudshell\\lib\\site-packages\\quali_utils\\QualiSystems.Packaging.exe', 'SetAttributeToService', '--packagepath', 'vlan dev.zip', '--topologyna
+me', 'vlan dev', '--servicealias', 'VLAN Manual', '--attributename', 'VLAN ID', '--attributevalue', '169', '--publish', 'False']
+done processing vlan dev after 5 seconds
+Update flow done after total 23 seconds
+```
+
+
+### Implementation Details
+This script uses the following flow:
+- automation api to search system for target blueprints
+- quali REST api to download target blueprint packages
+- cleans package of everything except topologies folder to optimize the import request
+- packaging api updates target attribute
+- Quali REST api loads package back into server