Resolve "Simulator implementation"

Closes #6 (closed).

• This is a sub-package for simulating FR3 robot with MuJoCo in ROS1 environment.
• Some minor features (e.g. Add parameters for package, Add MuJoCo UI utilities, Integration with real robot HW for digital twin, ...) can be further developed.
  • This will be described in issues.

.vscode/colcon.env

+SHELL=/bin/bash
+SESSION_MANAGER=local/jw-laptop-research:@/tmp/.ICE-unix/2435,unix/jw-laptop-research:/tmp/.ICE-unix/2435
+QT_ACCESSIBILITY=1
+XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
+XDG_MENU_PREFIX=gnome-
+GNOME_DESKTOP_SESSION_ID=this-is-deprecated
+LANGUAGE=en_US:en
+LC_ADDRESS=ko_KR.UTF-8
+GNOME_SHELL_SESSION_MODE=ubuntu
+LC_NAME=ko_KR.UTF-8
+SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
+ARGV0=/opt/cursor.appimage
+HISTTIMEFORMAT=%d/%m/%y %T 
+ELECTRON_RUN_AS_NODE=1
+XMODIFIERS=@im=ibus
+DESKTOP_SESSION=ubuntu
+LC_MONETARY=ko_KR.UTF-8
+SSH_AGENT_PID=2397
+VSCODE_AMD_ENTRYPOINT=vs/workbench/api/node/extensionHostProcess
+GTK_MODULES=gail:atk-bridge
+PWD=/home/jwhong/nix-project/impedance_controller
+NIX_PROFILES=/nix/var/nix/profiles/default /home/jwhong/.nix-profile
+GSETTINGS_SCHEMA_DIR=/tmp/.mount_cursorTfX5wF/usr/share/glib-2.0/schemas:
+XDG_SESSION_DESKTOP=ubuntu
+LOGNAME=jwhong
+XDG_SESSION_TYPE=x11
+GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
+VSCODE_CODE_CACHE_PATH=/home/jwhong/.config/Cursor/CachedData/001668006cc714afd397f4ef0d52862f5a095530
+XAUTHORITY=/run/user/1000/gdm/Xauthority
+GJS_DEBUG_TOPICS=JS ERROR;JS LOG
+WINDOWPATH=2
+HOME=/home/jwhong
+USERNAME=jwhong
+IM_CONFIG_PHASE=1
+LC_PAPER=ko_KR.UTF-8
+LANG=en_US.UTF-8
+XDG_CURRENT_DESKTOP=Unity
+VSCODE_IPC_HOOK=/run/user/1000/vscode-fb9a2cc1-0.42-main.sock
+NIX_SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
+INVOCATION_ID=0aa63630e9f04f72bd03c014a4282dbc
+MANAGERPID=2287
+CHROME_DESKTOP=cursor-url-handler.desktop
+APPDIR=/tmp/.mount_cursorTfX5wF
+GJS_DEBUG_OUTPUT=stderr
+XDG_SESSION_CLASS=user
+LC_IDENTIFICATION=ko_KR.UTF-8
+USER=jwhong
+OWD=/home/jwhong
+DISPLAY=:0
+VSCODE_PID=5931
+SHLVL=0
+LC_TELEPHONE=ko_KR.UTF-8
+QT_IM_MODULE=ibus
+LC_MEASUREMENT=ko_KR.UTF-8
+VSCODE_CWD=/home/jwhong
+PAPERSIZE=a4
+LD_LIBRARY_PATH=/tmp/.mount_cursorTfX5wF/usr/lib:
+APPIMAGE=/opt/cursor.appimage
+VSCODE_CRASH_REPORTER_PROCESS_TYPE=extensionHost
+XDG_RUNTIME_DIR=/run/user/1000
+LC_TIME=ko_KR.UTF-8
+LC_ALL=en_US.UTF-8
+JOURNAL_STREAM=8:46917
+XDG_DATA_DIRS=/tmp/.mount_cursorTfX5wF/usr/share/:./share/:/usr/share/gnome:/usr/local/share/:/usr/share/:/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop:/home/jwhong/.nix-profile/share:/nix/var/nix/profiles/default/share:/usr/share/gnome/:/usr/local/share/:/usr/share/:/home/jwhong/.nix-profile/share:/nix/var/nix/profiles/default/share
+GDK_BACKEND=x11
+PATH=/home/jwhong/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/tmp/.mount_cursorTfX5wF:/tmp/.mount_cursorTfX5wF/usr/sbin:/home/jwhong/.local/bin:/home/jwhong/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
+GDMSESSION=ubuntu
+ORIGINAL_XDG_CURRENT_DESKTOP=ubuntu:GNOME
+DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
+VSCODE_NLS_CONFIG={"userLocale":"en-us","osLocale":"en-us","resolvedLanguage":"en","defaultMessagesFile":"/tmp/.mount_cursorTfX5wF/resources/app/out/nls.messages.json","locale":"en-us","availableLanguages":{}}
+GIO_LAUNCHED_DESKTOP_FILE_PID=5931
+GIO_LAUNCHED_DESKTOP_FILE=/usr/share/applications/cursor.desktop
+VSCODE_HANDLES_UNCAUGHT_ERRORS=true
+LC_NUMERIC=ko_KR.UTF-8
+_=/usr/bin/env