Updating the doc/api

doc/api.md

 # Microservice API
+## PID microservices
 
 - __`msiCreateEpicPID(*uuid, *url, *handle, *http_code)`__
 
@@ -18,6 +19,16 @@
 
   `*http_code`: output, the HTTP code for the request, normally 200
 
+- __`msiGetEpicPIDMetadtaa(*handle, *metaName, *metaValue, *http_code)`__
+
+  `*handle`: the PID handle
+
+  `*metaName`: Metadata key in the handle system
+
+  `*metaValue`: output, Metadata value from the handle system
+
+  `*http_code`: output, the HTTP code for the request, normally 200
+
 - __`msiDeleteEpicPID(*handle, *http_code)`__
 
   `*handle`: the PID handle to delete
@@ -33,3 +44,32 @@
   `*value`: the metadata value, always a string
 
   `*http_code`: output, the HTTP code for the request, normally 200
+
+## Archival package microservices
+- __`msiArchiveCreate(*archive_name, *collection, *resource, *out)`__
+
+  `*archive_name`: name of the archive, suffix determines type of archive (tar, zip, bzip, ...)
+
+  `*collection`: iRODS collection to be archived
+
+  `*resource`: iRODS resource the archive should be placed on
+
+  `*out`: status
+
+- __`msiArchiveExtract(*archive_name, *destination_collection, *extract, *resource, *out)`__
+
+  `*archive_name`: name of the archive to be extracted
+
+  `*destination_collection`: iRODS collection where data shall be extracted to
+
+  `*extract`: Partial path as stored in the index of the archive if only one element should be extracted, null otherwise
+
+  `*resource`: iRODS resource the data should be placed on
+
+  `*out`: status
+
+- __`msiArchiveIndex(*archive_name, *out)`__
+
+  `*archive_name`: name of the archive
+
+  `*out`: status