Add src/SIMPLE-SEND.md

src/SIMPLE-SEND.md

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+# send
+
+## Overview
+The `send` function allows for securely uploading files or piped data to the Firefox Send-compatible server at `https://send.aenow.fun`. A random password is generated for each upload, and the upload has a default expiration of 7 days.
+
+## Usage
+
+### Upload a File
+```bash
+send <file>
+```
+
+### Upload Piped Data
+```bash
+echo "some data" | send
+```
+
+## Environment Variables
+
+- `FFSEND_URL`: URL to download the `ffsend` binary. Default: `https://github.com/timvisee/ffsend/releases/download/v0.2.76/ffsend-v0.2.76-linux-x64`
+- `FFSEND_DIR`: Directory to store the `ffsend` binary. Default: `$HOME/.local/bin`
+- `FFSEND_PATH`: Full path to the `ffsend` binary. Default: `$FFSEND_DIR/ffsend`
+- `DEFAULT_FFSEND_HOST`: Host URL for uploading files. Default: `https://send.aenow.fun`
+- `FFSEND_CUSTOM_HOST`: Custom host URL for uploading files. Overrides `DEFAULT_FFSEND_HOST`.
+
+## Installation
+The function will automatically install the `ffsend` binary if it is not present. The binary is downloaded from:
+```
+https://github.com/timvisee/ffsend/releases/download/v0.2.76/ffsend-v0.2.76-linux-x64
+```