Add code snippets

matlab/catalog/findCatalogColumn.m

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+%
+% -----------------
+% Copyright © 2022 ACK Cyfronet AGH, Poland.
+% --------------
+%
+% Returns index of the column with the specified colName within the given catalog
+%
+% TODO use this function in extractColumns.m
+function columnIdx = findCatalogColumn(catalog, colName)
+    for c=1:length(catalog)
+        if strcmp(catalog(c).field, colName)
+            columnIdx = c;
+            break;
+        end
+    end
+    if exist('columnIdx') ~= 1
+        error('no column named %s', colName);
+    end
+end