Upgrade 10.1 (#7)

* Initial upgrade to SXA 10.1
* Included example environment file
* Create .env file is none is present
* Include Sitecore package definition

.config/dotnet-tools.json

@@ -1,12 +1,10 @@
 {
-    "version": 1,
-    "isRoot": true,
-    "tools": {
-        "sitecore.cli": {
-            "version": "2.0.0",
-            "commands": [
-                "sitecore"
-            ]
-        }
-    }
-}
+	"version": 1,
+	"isRoot": true,
+	"tools": {
+		"sitecore.cli": {
+			"version": "3.0.0",
+			"commands": ["sitecore"]
+		}
+	}
+}

.env.example

@@ -0,0 +1,47 @@
+COMPOSE_PROJECT_NAME=sxa-xm
+REGISTRY=
+VERSION=
+
+SOLUTION_BUILD_IMAGE=mcr.microsoft.com/dotnet/framework/sdk:4.8
+SOLUTION_BASE_IMAGE=mcr.microsoft.com/windows/nanoserver:1809
+BUILD_CONFIGURATION=debug
+
+LOCAL_DEPLOY_PATH=.\src\Project\Styleguide\Website
+LOCAL_DATA_PATH=.\docker\data
+LOCAL_ITEM_PATH=.\src
+HOST_LICENSE_FOLDER=C:\Sitecore\License
+
+CM_HOST=cm.sxa.local
+CD_HOST=cd.sxa.local
+ID_HOST=id.sxa.local
+HRZ_HOST=hrz.sxa.local
+
+SITECORE_DOCKER_REGISTRY=scr.sitecore.com/sxp/
+SITECORE_TOOLS_REGISTRY=scr.sitecore.com/tools/
+SITECORE_MODULE_REGISTRY=scr.sitecore.com/sxp/modules/
+SITECORE_VERSION=10.1-ltsc2019
+MANAGEMENT_SERVICES_VERSION=3.0.0-1809
+TOOLS_VERSION=10.1-1809
+SPE_VERSION=6.2-1809
+SXA_VERSION=10.1-1809
+HORIZON_VERSION=2.26.0-ltsc2019
+HORIZON_ASSET_VERSION=2.26.0-1809
+
+SITECORE_ADMIN_PAS1SWORD=
+SQL_SA_PASSWORD=
+TELERIK_ENCRYPTION_KEY=
+SITECORE_IDSECRET=
+SITECORE_ID_CERTIFICATE=
+SITECORE_ID_CERTIFICATE_PASSWORD=
+
+# Because we are using a mounted license file, this value can be empty.
+# Included here to suppress 'variable is not set' warning from docker-compose.
+SITECORE_LICENSE=
+TRAEFIK_IMAGE=traefik:v2.2.0-windowsservercore-1809
+TRAEFIK_ISOLATION=hyperv
+ISOLATION=default
+
+SOLR_CORE_PREFIX_NAME=sitecore
+# You should change the shared secret to a random string and not use the default value
+MEDIA_REQUEST_PROTECTION_SHARED_SECRET=
+REPORTING_API_KEY=