Merge pull request microsoft#2 from microsoft/updateREADME

Update readme

Author: alekhyareddy28

README.md

@@ -1,3 +1,29 @@
+# Important Instructions \<To be removed before moving to PowerToys Repo>
+
+## Steps to build and run launcher successfully
+1. Restore the nuget packages 
+2. Download and install [Windows 10 SDK version 10.0.14393.795](https://go.microsoft.com/fwlink/p/?LinkId=838916). This SDK cannot be installed using the Visual Studio installer.
+3. Build and run PowerToys.sln in Debug/Release mode and x64 configuration.
+
+## Contribution details
+
+### To pull code from PowerToys repository
+
+```powershell
+cd Launcher
+git remote add public https://github.com/microsoft/PowerToys.git
+git pull public master
+git push origin <branchname>
+```
+
+### To pull code from Wox repository
+
+```powerhsell
+Git subtree pull --prefix src/modules/launcher https://github.com/jjw24/Wox.git master
+```
+
+**NOTE:** Do not use the `--squash` option while pulling changes from the subtree as that would result in all the changes being reflected as made by you, which would tamper the git history. 
+
 # Overview
 
 <img align="right" width="200" src="./doc/images/Logo.jpg" />