trying apostrophes

rename md to have only one period
fix md spelling mistakes
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create readme

tools/install-powershell-readme.md

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+# install-powershell.sh
+
+## Features of install-powershell.sh
+
+* can be called directly from git
+* optionally installs vs code and vs powershell extension (aka PowerShell IDE) using optional `-includeide` switch
+* defaults to completely automated operation (if appropriate permissions are available)
+* automatically looks up latest version via git tags
+* automatic selection of appropriate install sub-script
+* configures software installs for repositories when repositories are in place, otherwise pulls files from git releases.  As repository versions are made available, script will be updated to take advantage.
+* user permission checking
+* sub-installers called from local file system if they exist, otherwise pulled from git
+* sub-installers can be called directly if auto-selection is not needed
+
+## Minimum Requirements for install-powershell.sh
+
+* bash shell
+* `sed`
+* native package manager available
+* `curl` (auto-installed if missing)
+
+## Usage
+
+### Direct from Github
+
+```bash
+bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh) <ARGUMENTS>
+
+wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh | bash -s <ARGUMENTS>
+```
+
+### Local Copy
+
+```bash
+bash install-powershell.sh <ARGUMENTS>
+```
+
+## Examples
+
+### Only Install PowerShell Core:
+
+```bash
+bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh)
+```
+
+### Install PowerShell Core with IDE:
+
+```bash
+bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh) -includeide
+```
+
+### Install PowerShell Core with IDE and do tests that require a human to interact with the install process:
+
+```bash
+bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh) -includeide -interactivetesting
+```
+
+### Install AppImage:
+
+```bash
+bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh) -appimage
+```
+
+### Installation To do list
+
+* Detect and wait when package manager is busy/locked? - at least Ubuntu (CentOS does this internally)