update docs from github repository

Author: rtomas

src/common/docs/unity-connect-blockchain/_evm-get-account.mdx

@@ -1,14 +1,44 @@
 In this reference, we're using the `Nethereum` library to demonstrate how to make blockchain calls
 using it with Web3Auth.
 
+# Package installation instructions ([Official repository](https://github.com/Nethereum/Nethereum.Unity))
+
+Install via **Package Manager** using OpenUpm
+
+- open Edit/Project Settings/Package Manager
+
+- add a new **Scoped Registry** (or edit the existing OpenUPM entry)
+
+  - Name package.openupm.com
+
+  - URL https://package.openupm.com
+
+  - Scope(s) com.nethereum.unity
+
+- click Save or Apply
+
+- Open **Window/Package Manager**
+
+- click **+**
+
+- select Add package by name... or Add package from git URL...
+
+- paste **com.nethereum.unity** into name
+
+- paste **4.19.2** into version (or your preferred one)
+
+- click **Add**
+
+# Installing package for old version
+
 - Download the latest `net461dllsAOT.zip` package from Nethereum's
   [latest release](https://github.com/Nethereum/Nethereum/releases)
 
 - Extract and the rename the folder to `NethereumLib` for easy identification.
 
 - Move the folder to the `Assets/Plugins` folder of your Unity project.
 
-- You might have to delete a few files from the `NethereumLib` folder, if you're getting any errors
+- You might have to delete a few files from the `NethereumLib` fold er, if you're getting any errors
   while building the project. For our implementation, we deleted the following files:
   `Newtonsoft.Json.dll`, all the files starting with `System.*`, `UnityEngine.dll`,
   `Nethereum.Web3Lite.dll`, `Nethereum.HdWallet.dll`, `NBitcoin.dll`, `Nethereum.RPC.Reactive.dll`

src/common/docs/unity-connect-blockchain/_evm-installation.mdx

@@ -1,6 +1,36 @@
 In this reference, we're using the `Nethereum` library to demonstrate how to make blockchain calls
 using it with Web3Auth.
 
+# Package installation instructions ([Official repository](https://github.com/Nethereum/Nethereum.Unity))
+
+Install via **Package Manager** using OpenUpm
+
+- open Edit/Project Settings/Package Manager
+
+- add a new **Scoped Registry** (or edit the existing OpenUPM entry)
+
+  - Name package.openupm.com
+
+  - URL https://package.openupm.com
+
+  - Scope(s) com.nethereum.unity
+
+- click Save or Apply
+
+- Open **Window/Package Manager**
+
+- click **+**
+
+- select Add package by name... or Add package from git URL...
+
+- paste **com.nethereum.unity** into name
+
+- paste **4.19.2** into version (or your preferred one)
+
+- click **Add**
+
+# Installing package for old version
+
 - Download the latest `net461dllsAOT.zip` package from Nethereum's
   [latest release](https://github.com/Nethereum/Nethereum/releases)