docs: Add README

While here, clean up and s/zb64/b64/g

README.md

@@ -0,0 +1,56 @@
+# b64
+
+Is a tool I created to
+* Quickly encode and decode base64
+* Learn a bit of Zig
+
+
+## Usage
+```
+Usage: b64 [-e] [-d] <string>
+
+    -h, --help
+            Display this help and exit.
+
+    -d, --decode
+            Decode base64 to string.
+
+    -e, --encode
+            Encode string to base64.
+
+    -v, --version
+            Display version.
+
+    <str>
+            String to encode or decode.
+```
+### Encoding
+
+```shell
+$ b64 -e "encode this string to base64"
+ZW5jb2RlIHRoaXMgc3RyaW5nIHRvIGJhc2U2NA==
+
+# From stdin
+$ echo -n "encode this string to base64" | b64 -e
+ZW5jb2RlIHRoaXMgc3RyaW5nIHRvIGJhc2U2NA==
+$
+```
+
+### Decoding
+```shell
+$ b64 -d ZW5jb2RlIHRoaXMgc3RyaW5nIHRvIGJhc2U2NA==
+encode this string to base64
+
+# From stdin
+$ echo -n "ZW5jb2RlIHRoaXMgc3RyaW5nIHRvIGJhc2U2NA==" | b64 -d
+encode this string to base64
+$
+```
+
+## Build
+
+```shell
+$ git clone https://git.kcbark.net/zig/b64.git && cd b64
+$ zig build -Doptimize=ReleaseFast
+$ cp zig-out/bin/b64 ~/.local/bin
+```

build.zig

@@ -21,7 +21,7 @@ pub fn build(b: *std.Build) void {
     var opt = b.addOptions();
     opt.addOption([]const u8, "version", "0.0.1");
     const exe = b.addExecutable(.{
-        .name = "zb64",
+        .name = "b64",
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
         .root_source_file = .{ .path = "src/main.zig" },

build.zig.zon

@@ -1,5 +1,5 @@
 .{
-  .name = "zb64",
+  .name = "b64",
   .version = "0.0.1",
   .dependencies = .{
     .clap = .{

src/main.zig

@@ -109,11 +109,11 @@ pub fn main() !void {
 }
 
 fn usage() void {
-    std.debug.print("Usage: zb64 [-e] [-d] <string>\n\n", .{});
+    std.debug.print("Usage: b64 [-e] [-d] <string>\n\n", .{});
 }
 
 fn version() void {
-    std.debug.print("zb64 - {s}\n", .{build_info.version});
+    std.debug.print("b64 - {s}\n", .{build_info.version});
 }
 
 fn read_from_stream(allocator: std.mem.Allocator, stream: std.fs.File) !std.ArrayList(u8) {