Added errorcodes
diff --git a/Errorcodes b/Errorcodes
new file mode 100644
index 0000000..537da15
--- /dev/null
+++ b/Errorcodes
@@ -0,0 +1,78 @@
+* 600 - 699 - Lucene Backend error codes
+600: "Unable to read index"
+601: "Unable to find index"
+602: "Unable to add document to index"
+603: "Unable to commit staged data to index"
+604: "Unable to connect to database"
+610: "Missing request parameters"
+620: "Unable to generate JSON"
+621: "Unable to parse JSON"
+680: "Server is up and running!"
+681: "Document was added successfully", document id
+682: "Response time exceeded"
+
+* 700 - 799 - Coral Deserialization errors
+700: "No Query given"
+701: "JSON-LD group has no @type attribute"
+702: "Boundary definition is invalid"
+703: "Group expects operation"
+704: "Operation needs operand list"
+705: "Number of operands is not acceptable"
+706: "Frame type is unknown"
+707: "Distance Constraints have to be defined as arrays"
+708: "No valid distances defined"
+709: "Valid class numbers exceeded"
+710: "Class attribute missing"
+711: "Unknown group operation"
+712: "Unknown reference operation"
+713: "Query type is not supported"
+714: "Span references expect a start position and a length parameter"
+715: "Attribute type is not supported"
+716: "Unknown relation"
+740: "Key definition is missing in term or span"
+741: "Match relation unknown"
+742: "Term group needs operand list"
+743: "Term group expects a relation"
+744: "Operand not supported in term group"
+745: "Token type is not supported"
+746: "Term type is not supported - treated as a string"
+747: "Attribute is null"
+750: "Passed notifications are not well formed"
+760: "Exclusion is currently not supported in position operations"
+761: "Class reference operators are currently not supported"
+762: "Span references are currently not supported" (Not in use)
+763: "Excluding distance constraints are currently not supported"
+764: "Class reference checks are currently not supported - results may not be correct"
+765: "Relations are currently not supported"
+766: "Peripheral references are currently not supported"
+767: "Case insensitivity is currently not supported for this layer"
+768: "Attributes are currently not supported - results may not be correct"
+769: "Overlap variant currently interpreted as overlap"
+770: "Arity attributes are currently not supported - results may not be correct"
+771: "Arbitrary elements with attributes are currently not supported"
+780: "This query matches everywhere"
+781: "Optionality of query is ignored"
+782: "Exclusivity of query is ignored"
+799: Unknown query serialization message (Arbitrary string)
+
+* 800 - 899 - Virtual Collection Messages
+802: "Match type is not supported by value type"
+804: "Unknown value type"
+805: "Value is invalid"
+806: "Value is not a valid date string"
+807: "Value is not a valid regular expression"
+810: "Unknown document group operation" (like 711)
+811: "Document group expects operation" (like 703)
+812: "Operand not supported in document group" (like 744)
+813: "Collection type is not supported" (like 713)
+814: "Unknown rewrite operation"
+815: "Rewrite expects source"
+830: "Filter was empty"
+831: "Filter is not wrappable"
+832: "Filter operation is invalid"
+850: "Collections are deprecated in favour of a single collection"
+851: "Legacy filters need @value fields"
+
+* 900 - 999 - Corpus Data errors
+952: "Given offset information is not numeric"
+953: "Given offset information is incomplete"
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