Cleanup docker readme. (#1233)

Cleanup docker readme.

README-docker.md

@@ -0,0 +1,72 @@
+## What is Docker used for
+
+Developers can simulate Device hardware by compiling and running
+a linux native binary application. If you do not own a Linux
+machine, or you just want to separate things, you might want
+to run simulator inside a docker container
+
+## The Image
+To build docker image, type
+
+  `docker build -t meshtastic/device .`
+
+## Usage
+
+To run a container, type
+
+  `docker run --rm -p 4403:4403 meshtastic/device`
+
+or, to get an interactive shell on the docker created container:
+
+  `docker run -it -p 4403:4403 meshtastic/device bash`
+
+You might want to mount your local development folder:
+
+  `docker run -it --mount type=bind,source=/PathToMyProjects/Meshtastic/Meshtastic-device-mybranch,target=/Meshtastic-device-mybranch -p 4403:4403 meshtastic/device bash`
+
+## Build the native application
+
+Linux native application should be built inside the container.
+For this you must run container with interactive console
+"-it", as seen above.
+
+First, some environment variables need to be set up with command:
+
+  `. ~/.platformio/penv/bin/activate`
+
+You also want to make some adjustments in the bin/build-all.sh to conform the amd64 build:
+
+```
+  sed -i 's/^BOARDS_ESP32.*/BOARDS_ESP32=""/' bin/build-all.sh
+  sed -i 's/^BOARDS_NRF52.*/BOARDS_NRF52=""/' bin/build-all.sh
+  sed -i 's/echo "Building SPIFFS.*/exit/' bin/build-all.sh
+```
+
+You can build amd64 image with command
+
+`bin/build-all.sh`
+
+## Executing the application interactively
+
+The built binary file should be found under name
+`release/latest/bins/universal/meshtastic_linux_amd64`.
+If this is not the case, you can also use direct program name:
+`.pio/build/native/program`
+
+To use python cli against exposed port 4403,
+type this in the host machine:
+
+`meshtastic --info --host localhost`
+
+## Stop the container
+
+Run this to get the ID:
+
+`docker ps`
+
+Stop the container with command:
+
+`docker kill <id>`
+
+> Tip: you can just use the first few characters of the ID in docker commands
+

docker.txt

@@ -1,17 +0,0 @@
-To build:
-  docker build -t meshtastic/device .
-
-To run:
-  docker run --rm -p 4403:4403 meshtastic/device
-or, to get a shell on the docker image:
-  docker run -it meshtastic/device bash
-
-To use python cli against it:
-  meshtastic --info --host localhost
-
-To stop:
-  # run this to get id
-  docker ps
-  # tip: you can just use the first few characters of the id in the next command
-  docker kill <id>
-