docs: add README.md for countEntriesInDirectory

cli/yargs/countEntriesInDirectory/README.md

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+# countEntriesInDirectory
+
+This is a CLI built with [yargs](https://www.npmjs.com/package/yargs) that searches the directory (path) passed to it and then spits out how many entries (files and directories) are within _that directory_. It does not recursively search additional directories within it.
+
+## Usage
+
+Here is the output of running `node bin/cli.js -h` from the `countEntriesInDirectory` directory:
+
+```bash
+Usage: cli.js --directory=[path to a directory]
+
+Options:
+  --help           Show help                                           [boolean]
+  --version        Show version number                                 [boolean]
+  --directory, -d  the directory to count files within.               [required]
+```
+
+### As a Local Project
+
+You'll want to start by installing dependencies:
+
+```
+npm install
+```
+
+Since this is a CLI, you'll probably want to get it available on your PATH. There's two ways you can do this:
+
+**Via global installation:**
+
+```bash
+npm i -g . # this will install the current working directory as a global module. you will want to do npm uninstall -g . to uninstall it.
+countEntriesInDirectory --directory=. # run the CLI
+```
+
+**Via symlink:**
+
+```bash
+npm link # this will create a symlink that makes the module act as a global module. npm unlink to remove this.
+countEntriesInDirectory --directory=. # run the CLI
+```
+
+### As a Module Published to npm
+
+If you were to pulbish this CLI to npm, there'd be two ways you'd use it from the registry with npm (let's assume you published as `count-entries-in-directory`):
+
+```bash
+npm i -g count-entries-in-directory # this would install the module from the registry and make it globally available
+countEntriesInDirectory --directory=. # run the CLI
+```
+
+```bash
+npx count-entries-in-directory --directory=. # this would temporarily download the module, run the first entry in `bin` of package.json and pass along any additional arguments like `--directory=.`
+```