feat add readme

Readme.md

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+# Backblaze Backup Tool
+
+This is a tool to backup files and directories to Backblaze.
+
+## Prerequisites
+
+- Go 1.16 or higher
+- Backblaze account with a bucket created
+- Environment variables `BB_ID` and `BB_KEY` set with your Backblaze account ID and application key respectively
+
+## Building the Application
+
+You can build the application using the provided Makefile. 
+
+### On Linux:
+
+```bash
+make rebuild
+```
+
+### On Windows:
+
+You will need to have make installed. If you don't have it, you can install it through Chocolatey:
+```bash
+choco install make
+```
+
+Then you can run the same command as on Linux:
+```bash
+make rebuild
+```
+
+This will create a binary in the bin directory.
+
+
+## Running the Application
+
+You can run the application directly from the command line. Here's how to do it:
+```bash
+./bin/backblaze-backup --bucket "your-bucket-name" --dir "/path/to/directory"
+```
+
+Or if you want to upload a single file:
+```bash
+./bin/backblaze-backup --bucket "your-bucket-name" --file "/path/to/file"
+```
+
+## Flags
+
+    --bucket: The name of your Backblaze bucket
+    --dir: The absolute path of the directory you want to upload to Backblaze
+    --file: The absolute path of the file you want to upload to Backblaze
+
+Note: You must select just one option, dir or file.
+
+Please replace `"your-bucket-name"`, `"/path/to/directory"`, and `"/path/to/file"` with your actual bucket name and paths.