Add Odin language

lib/languages/odin.txt

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+!e
+//\p
+import
+package
+/*\pj-->>*/\pj

tests/odin/sample/code.odin

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+// Package gigasecond constains functionality to add a gigasecond
+// to a period of time
+package gigasecond
+
+import "core:time/datetime"
+
+/*Giga seconds
+are 10^3 bigger than Mega seconds
+*/
+Gigasecond := datetime.Delta{seconds = 1e9}
+
+// add_gigasecond adds a Gigasecond to the given time
+add_gigasecond :: proc(time: datetime.DateTime) -> datetime.DateTime {  //Even more comments
+    /* We'll ignore any errors
+     */
+    return datetime.add_delta_to_date(time, Gigasecond)
+}

tests/odin/sample/expected_snippet.odin

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+Gigasecond := datetime.Delta{seconds = 1e9}
+
+add_gigasecond :: proc(time: datetime.DateTime) -> datetime.DateTime {  
+    return datetime.add_delta_to_date(time, Gigasecond)
+}