Add a collector generator script

tools/collector-generator/README.md

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+# Collector generator
+Generates a collector skeleton implementation from a WMI class. 
+
+## Usage
+Build the generator:
+
+```bash
+go build .
+```
+
+Run the script to query the WMI service and send the output to the generator:
+
+```powershell
+.\New-Collector.ps1 -Class Win32_PerfRawData_PerfOS_Processor
+```
+
+This will generate a collector. The collector name is generated by first removing `Win32_PerfRawData_Perf` and lower-casing, so `Win32_PerfRawData_PerfOS_Processor` will generate `os_processor.go`. This can be overridden by passing `-CollectorName` to the script.