Add LICENSE and README.md for VBA-JSON library

- Added MIT License file to the json-converter directory.
- Created README.md with usage examples, installation instructions, and options for the VBA-JSON library.

third-party-libraries/vba/json-converter/README.md

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+# VBA-JSON
+
+JSON conversion and parsing for VBA (Windows and Mac Excel, Access, and other Office applications).
+It grew out of the excellent project [vba-json](https://code.google.com/p/vba-json/),
+with additions and improvements made to resolve bugs and improve performance (as part of [VBA-Web](https://github.com/VBA-tools/VBA-Web)).
+
+Tested in Windows Excel 2013 and Excel for Mac 2011, but should apply to 2007+.
+
+- For Windows-only support, include a reference to "Microsoft Scripting Runtime"
+- For Mac and Windows support, include [VBA-Dictionary](https://github.com/VBA-tools/VBA-Dictionary)
+
+<a href="https://www.patreon.com/timhall">
+  <img src="https://timhall.github.io/assets/donate-patreon@2x.png" width="217" alt="Donate">
+</a>
+
+# Examples
+
+```vb
+Dim Json As Object
+Set Json = JsonConverter.ParseJson("{""a"":123,""b"":[1,2,3,4],""c"":{""d"":456}}")
+
+' Json("a") -> 123
+' Json("b")(2) -> 2
+' Json("c")("d") -> 456
+Json("c")("e") = 789
+
+Debug.Print JsonConverter.ConvertToJson(Json)
+' -> "{"a":123,"b":[1,2,3,4],"c":{"d":456,"e":789}}"
+
+Debug.Print JsonConverter.ConvertToJson(Json, Whitespace:=2)
+' -> "{
+'       "a": 123,
+'       "b": [
+'         1,
+'         2,
+'         3,
+'         4
+'       ],
+'       "c": {
+'         "d": 456,
+'         "e": 789  
+'       }
+'     }"
+```
+
+```vb
+' Advanced example: Read .json file and load into sheet (Windows-only)
+' (add reference to Microsoft Scripting Runtime)
+' {"values":[{"a":1,"b":2,"c": 3},...]}
+
+Dim FSO As New FileSystemObject
+Dim JsonTS As TextStream
+Dim JsonText As String
+Dim Parsed As Dictionary
+
+' Read .json file
+Set JsonTS = FSO.OpenTextFile("example.json", ForReading)
+JsonText = JsonTS.ReadAll
+JsonTS.Close
+
+' Parse json to Dictionary
+' "values" is parsed as Collection
+' each item in "values" is parsed as Dictionary
+Set Parsed = JsonConverter.ParseJson(JsonText)
+
+' Prepare and write values to sheet
+Dim Values As Variant
+ReDim Values(Parsed("values").Count, 3)
+
+Dim Value As Dictionary
+Dim i As Long
+
+i = 0
+For Each Value In Parsed("values")
+  Values(i, 0) = Value("a")
+  Values(i, 1) = Value("b")
+  Values(i, 2) = Value("c")
+  i = i + 1
+Next Value
+
+Sheets("example").Range(Cells(1, 1), Cells(Parsed("values").Count, 3)) = Values
+```
+
+## Options
+
+VBA-JSON includes a few options for customizing parsing/conversion if needed:
+
+- __UseDoubleForLargeNumbers__ (Default = `False`) VBA only stores 15 significant digits, so any numbers larger than that are truncated.
+  This can lead to issues when BIGINT's are used (e.g. for Ids or Credit Cards), as they will be invalid above 15 digits.
+  By default, VBA-JSON will use `String` for numbers longer than 15 characters that contain only digits, use this option to use `Double` instead.
+- __AllowUnquotedKeys__ (Default = `False`) The JSON standard requires object keys to be quoted (`"` or `'`), use this option to allow unquoted keys.
+- __EscapeSolidus__ (Default = `False`) The solidus (`/`) is not required to be escaped, use this option to escape them as `\/` in `ConvertToJson`.
+
+```VB.net
+JsonConverter.JsonOptions.EscapeSolidus = True
+```
+
+## Installation
+
+1. Download the [latest release](https://github.com/VBA-tools/VBA-JSON/releases)
+2. Import `JsonConverter.bas` into your project (Open VBA Editor, `Alt + F11`; File > Import File)
+3. Add `Dictionary` reference/class
+   - For Windows-only, include a reference to "Microsoft Scripting Runtime"
+   - For Windows and Mac, include [VBA-Dictionary](https://github.com/VBA-tools/VBA-Dictionary)
+
+## Resources
+
+- [Tutorial Video (Red Stapler)](https://youtu.be/CFFLRmHsEAs)