Adding README for Parameter Transpilers

Author: James Brundage

Transpilers/Parameters/README.ps1.md

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+This directory and it's subdirectories contain Transpilers that transform parameter attributes.
+
+Parameter Transpilers do not need to take any values from the pipeline.
+They will be called by the Core PipeScript Transpiler ```PipeScript.ParameterAttribute```.
+
+When Transpiling a Parameter, the Transpiler should return one of two things.
+
+1. An empty ```[ScriptBlock]``` preceeded by attributes or help.  This will replace the Transpiled attribute with a real one.
+2. A ```[Collections.IDictionary]``` can be used to send arguments directly back to ```Update-PipeScript```.
+
+Many parameter transpilers can also apply to a ```[Management.Automation.Language.VariableExpressionAst]```.  
+
+When this is the case it is common for the transpiler to add a ```[ValidateScript]``` attribute to the variable.  This will constraint the value of that variable.
+
+## List Of Parameter Transpilers
+
+~~~PipeScript{
+    [PSCustomObject]@{
+        Table = Get-Transpiler -TranspilerPath $pwd |
+            Select-Object DisplayName, @{
+                Name='Synopsis'
+                Expression= { $_.Synopsis -replace '[\s\r\n]+$' }
+            }, @{
+                Name='Link'
+                Expression = { $_.Name }
+            }
+    }
+}
+~~~
+
+
+