update readme with new examples

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit b099c9c)
Signed-off-by: Tibor Vass <tibor@docker.com>

README.md

@@ -12,18 +12,31 @@ Development
 
 `docker/cli` is developed using Docker.
 
-Build a linux binary:
+Build CLI from source:
 
 ```
-$ make -f docker.Makefile binary
+$ docker buildx bake
 ```
 
 Build binaries for all supported platforms:
 
 ```
-$ make -f docker.Makefile cross
+$ docker buildx bake cross
 ```
 
+Build for a specific platform:
+
+```
+$ docker buildx bake --set binary.platform=linux/arm64 
+```
+
+Build dynamic binary for glibc or musl:
+
+```
+$ USE_GLIBC=1 docker buildx bake dynbinary 
+```
+
+
 Run all linting:
 
 ```
@@ -44,12 +57,6 @@ Start an interactive development environment:
 $ make -f docker.Makefile shell
 ```
 
-In the development environment you can run many tasks, including build binaries:
-
-```
-$ make binary
-```
-
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