Add Valheim template.

valheim.kvp

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+Meta.DisplayName=Valheim
+Meta.Description=
+Meta.OS=Windows, Linux
+Meta.Author=CubeCoders Limited
+Meta.URL=https://www.valheimgame.com/
+Meta.DisplayImageSource=steam:892970
+Meta.EndpointURIFormat=steam://connect/{ip}:{GenericModule.App.ApplicationPort2}
+Meta.ConfigManifest=valheimconfig.json
+Meta.ConfigRoot=valheim.kvp
+App.DisplayName=Valheim
+App.RootDir=./Valheim/
+App.ExecutableWin=896660\valheim_server.exe
+App.ExecutableLinux=896660/valheim_server.x86_64
+App.WorkingDir=896660
+App.CommandLineArgs=-port {{$ApplicationPort1}} {{$FormattedArgs}} -savedir "Data" -public 1
+App.CommandLineVars={"ServerName": "My Valheim Server - Powered by AMP", "WorldName": "PoweredByAMP", "ServerPassword": "12345"}
+App.EnvironmentVariables={"LD_LIBRARY_PATH": "./linux64:%LD_LIBRARY_PATH%", "SteamAppId": "892970"}
+App.CommandLineParameterFormat=-{0} "{1}"
+App.ExitMethod=OS_CLOSE
+App.ExitString=
+App.ExitFile=
+App.HasWriteableConsole=False
+App.HasReadableConsole=True
+App.ApplicationIPBinding=0.0.0.0
+App.ApplicationPort1=2456
+App.ApplicationPort2=2457
+App.ApplicationPort3=2458
+App.RemoteAdminPort=0
+App.MaxUsers=10
+App.UseRandomAdminPassword=False
+App.RemoteAdminPassword=Password123
+App.AdminMethod=STDIO
+App.UpdateSource=SteamCMD
+App.Compatibility=None
+App.SteamUpdateAnonymousLogin=True
+App.SteamForceWindowsVersion=False
+App.UpdateSourceData=896660
+App.UpdateSourceArgs=
+App.UpdateSourceVersion=
+App.UnzipUpdateSource=False
+App.OverwriteExistingFiles=False
+App.ApplicationReadyMode=RegexMatch
+Console.FilterMatchRegex=^\d\d\/\d\d\/\d{4} \d\d:\d\d:\d\d: 
+Console.FilterMatchReplacement=
+Console.ThrowawayMessageRegex=^\(Filename: .*? Line: \d+\)$
+Console.AppReadyRegex=^Game server connected$
+Console.UserJoinRegex=^Got character ZDOID from (?<username>.+?) : (?<userid>-?\d+):\d+$
+Console.UserLeaveRegex=^Destroying abandoned non persistent zdo -?\d+:\d+ owner (?<userid>-?\d+)$
+Console.UserChatRegex=
+Console.UserActions={}

valheimconfig.json

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+[
+  {
+    "DisplayName": "Server Name",
+    "Description": "Server name as it appears in the server list",
+    "FieldName": "ServerName",
+    "Keywords": "",
+    "InputType": "text",
+    "Category": "Server",
+    "ParamFieldName": "name",
+    "IncludeInCommandLine": true
+  },
+  {
+    "DisplayName": "World Seed",
+    "Description": "Random seed used for terrain random generation",
+    "FieldName": "WorldName",
+    "Keywords": "world",
+    "InputType": "text",
+    "Category": "Server",
+    "ParamFieldName": "world",
+    "IncludeInCommandLine": true
+  },
+  {
+    "DisplayName": "Server Password",
+    "Description": "Password that clients must supply in order to connect",
+    "FieldName": "ServerPassword",
+    "Keywords": "",
+    "InputType": "password",
+    "Category": "Server",
+    "ParamFieldName": "password",
+    "IncludeInCommandLine": true
+  }
+]