Create INSTALL.md

Author: zenorocha

INSTALL.md

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+### [PowerShell Console](https://github.com/PowerShell/PowerShell)
+
+A dark theme for the Windows 10 Console, supports both PowerShell and cmd.exe.
+
+#### Theme Installation
+
+1.  [Download and unzip](https://raw.githubusercontent.com/dracula/powershell/master/dist/ColorTool.zip) ColorTool. The [source code](https://github.com/Microsoft/console/tree/master/tools/ColorTool) is available from Microsoft.
+2.  Open PowerShell, navigate to unzipped `ColorTool` directory, and run `ColorTool.exe -b Dracula.ini`.
+3.  Right-click on the window titlebar and choose `Properties`, then on the `Font` tab choose Consolas. Click `OK` to save.
+    *   Note that this step is required, even if your font is already set to Consolas, due to the way that the windows console saves its settings.
+
+For cmd.exe support, perform the same steps above but in a cmd.exe window.
+
+#### PowerShell prompt
+
+1.  Install the 1.0 version of posh-git.
+    *   It's currently prerelease, so you'll need to install it with `Install-Module -Name posh-git -AllowPrerelease -Force`
+    *   If you don't have an `-AllowPrerelease` flag, upgrade PowerShellGet with `Install-Module -Name PowerShellGet -Force` first.
+2.  Ensure the latest version of PSReadLine (2.0 or later) is installed. It's installed by default in Windows 10, but you'll most likely [need to upgrade it](https://github.com/lzybkr/PSReadLine#user-content-upgrading).
+3.  Include [this powershell configuration](https://github.com/dracula/powershell/blob/master/theme/dracula-prompt-configuration.ps1) in your PowerShell `$profile` file.
+
+#### cmd.exe prompt
+
+Set the environment variable `prompt` to `$E[1;32;40m→ $E[1;36;40m$p$E[1;35;40m› $E[1;37;40m`
+
+#### Questions?
+
+See our [FAQ section](https://github.com/dracula/powershell#frequently-asked-questions) for answers, or [open an issue](https://github.com/dracula/powershell/issues) for help.