DOC-9216: Import Data example code for guide

Example code for the guide at:
	couchbase/docs-server#2317

Author: osfameron

modules/howtos/examples/Import.csx

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+// Run this using dotnet-script: https://github.com/filipw/dotnet-script
+//
+//      dotnet script Import.csx
+//
+
+#r "nuget: CouchbaseNetClient, 3.2.5"
+
+#r "nuget: CsvHelper, 27.2.1"
+
+using System.Threading.Tasks;
+using Couchbase;
+using Couchbase.KeyValue;
+
+// tag::csv-tsv-import[]
+using CsvHelper;
+using CsvHelper.Configuration;
+using System.Globalization;
+// end::csv-tsv-import[]
+
+// tag::json-jsonl-import[]
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+// end::json-jsonl-import[]
+
+
+using System.Runtime.CompilerServices;
+
+// https://github.com/filipw/dotnet-script
+public static string GetScriptFolder([CallerFilePath] string path = null) => Path.GetDirectoryName(path);
+Directory.SetCurrentDirectory(GetScriptFolder());
+
+// tag::connect[]
+var cluster = await Cluster.ConnectAsync(
+    "couchbase://localhost",
+    "Administrator", "password");
+var bucket =  await cluster.BucketAsync("travel-sample");
+var scope = await bucket.ScopeAsync("inventory");
+var _collection = await scope.CollectionAsync("airline");
+// end::connect[]
+
+// tag::importCSV[]
+public async Task importCSV(string filename)
+{
+    using (var reader = new StreamReader(filename))
+    using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
+    {
+        var records = csv.GetRecords<dynamic>();
+        foreach (dynamic record in records) {
+            await upsertDocument(record);
+        }
+    }
+}
+// end::importCSV[]
+await importCSV("import.csv");
+
+// tag::importTSV[]
+public async Task importTSV(string filename)
+{
+    using (var reader = new StreamReader("import.tsv"))
+    using (var tsv = new CsvReader(reader,
+        new CsvConfiguration(CultureInfo.InvariantCulture)
+            { Delimiter = "\t" }))
+    {
+        var records = tsv.GetRecords<dynamic>();
+        foreach (dynamic record in records) {
+            await upsertDocument(record);
+        }
+    }
+}
+// end::importTSV[]
+await importTSV("import.tsv");
+
+// tag::importJSON[]
+public async Task importJSON(string filename)
+{
+    using (var reader = new StreamReader("import.json"))
+    {
+        var jsonReader = new JsonTextReader(reader);
+        JArray arr = (JArray)JToken.ReadFrom(jsonReader);
+        
+        foreach (JObject record in arr)
+        {
+            await upsertDocument(record);
+        }
+    }
+}
+// end::importJSON[]
+await importJSON("import.json");
+
+// tag::importJSONL[]
+public async Task importJSONL(string filename)
+{
+    using (var reader = new StreamReader("import.jsonl"))
+    {
+        var jsonlReader = new JsonTextReader(reader)
+        {
+            SupportMultipleContent = true
+        };
+        while (jsonlReader.Read())
+        {
+            var record = (JObject)JToken.ReadFrom(jsonlReader);
+            await upsertDocument(record);
+
+        }
+    }
+}
+// end::importJSONL[]
+await importJSONL("import.jsonl");
+
+
+// tag::upsertDocument[]
+// CsvHelper emits `dynamic` records
+public async Task upsertDocument(dynamic record) {
+    // define the key
+    string key = record.type + "_" + record.id;
+
+    // do any additional processing
+    record.importer = ".NET SDK";
+
+    // upsert the document
+    await _collection.UpsertAsync(key, record);
+
+    // any required logging
+    Console.WriteLine(key);
+}
+
+// Newtonsoft.Json.Linq emits `JObjects`
+public async Task upsertDocument(JObject record) {
+    // define the key
+    string key = record["type"] + "_" + record["id"];
+
+    // do any additional processing
+    record["importer"] = ".NET SDK";
+    
+    // upsert the document
+    await _collection.UpsertAsync(key, record);
+    
+    // any required logging
+    Console.WriteLine(key);
+}
+// end::upsertDocument[]

modules/howtos/examples/import.csv

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+id,type,name
+20001,airline,CSV-air-1
+20002,airline,CSV-air-2

modules/howtos/examples/import.json

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+[
+	{"id":20021, "type":"airline", "name":"JSON-air-1"},
+	{"id":20022, "type":"airline", "name":"JSON-air-2"},
+	{"id":20023, "type":"airline", "name":"JSON-air-3"}
+]

modules/howtos/examples/import.jsonl

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+{"id":20031, "type":"airline", "name":"JSONL-air-1"}
+{"id":20032, "type":"airline", "name":"JSONL-air-2"}
+{"id":20033, "type":"airline", "name":"JSONL-air-3"}

modules/howtos/examples/import.tsv

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+id	type	name
+20011	airline	TSV-air-1
+20012	airline	TSV-air-2