add basic README and removed psget dep because PSCore ships with it (#3)

Author: TylerLeonhardt

README.md

@@ -1 +1,36 @@
-# PowerShell-IoT
+# PowerShell-IoT
+
+Docs will change...
+
+## Getting Started
+
+### Prereqs
+
+* [PowerShell Core 6 or greater](https://github.com/PowerShell/PowerShell/releases)
+* [.NET Core SDK 2.0 or greater](https://www.microsoft.com/net/download/)
+* [InvokeBuild](https://www.powershellgallery.com/packages/InvokeBuild/)
+
+### Building
+
+1. Clone/download the repo
+2. run `./build.ps1 -Bootstrap` to see if you're missing any tooling
+3. run `./build.ps1` to build
+
+At this point you can import the built module and mess with it:
+
+```powershell
+Import-Module ./src/psiot/bin/Debug/netcoreapp2.0/PSIoT.psd1
+Get-GpioPin 2
+```
+
+You can package the build up by using Invoke-Build:
+
+```powershell
+Invoke-Build Package
+```
+
+You can run tests, but they don't do anything right now:
+
+```powershell
+./build.ps1 -Test
+```

build.ps1

@@ -16,7 +16,6 @@ param(
 $NeededTools = @{
     PowerShellCore = "PowerShell Core 6.0.0 or greater"
     DotNetSdk = "dotnet sdk 2.0 or greater"
-    PowerShellGet = "PowerShellGet latest"
     InvokeBuild = "InvokeBuild latest"
 }
 
@@ -38,13 +37,6 @@ function needsDotNetSdk () {
     return $false
 }
 
-function needsPowerShellGet () {
-    if (Get-Module -ListAvailable -Name PowerShellGet) {
-        return $false
-    }
-    return $true
-}
-
 function needsInvokeBuild () {
     if (Get-Module -ListAvailable -Name InvokeBuild) {
         return $false
@@ -61,9 +53,6 @@ function getMissingTools () {
     if (needsDotNetSdk) {
         $missingTools += $NeededTools.DotNetSdk
     }
-    if (needsPowerShellGet) {
-        $missingTools += $NeededTools.PowerShellGet
-    }
     if (needsInvokeBuild) {
         $missingTools += $NeededTools.InvokeBuild
     }