Adds atwood machine

Followed tutorial here:
https://latexdraw.com/free-body-diagram-of-atwoods-machine-in-tikz/

atwood-machine.tex

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+% Based on tutorial here: https://latexdraw.com/free-body-diagram-of-atwoods-machine-in-tikz/
+\documentclass[tikz]{standalone}
+
+\usetikzlibrary{patterns,shapes.geometric}
+\begin{document}
+
+\begin{tikzpicture}
+	% Pulley
+	\draw[fill = black!70] (0,0) circle (1.5cm); % Big circle
+	\draw[fill=black!40] (0,0) circle (1.3cm); % Medium circle
+	% Note that the colon here means polar coordinates are being used
+	% 75:2.5 means 75 degrees and 2.5 cm
+	\draw[fill=white] (75:2.5) to[rounded corners=0.2cm] (0.2,-0.25) to[rounded corners=0.2cm]
+	(-0.2,-0.25) -- (105:2.5);
+	\draw[fill=black!90] (0,0) circle (0.12cm); % Axle circle
+
+	% Supporting structure
+	\fill[pattern= north west lines,] (-2.5,2.41) rectangle (2.5,2.6);
+	\draw(-2.5,2.41) -- (2.5,2.41);
+
+	% Mass 1
+	\draw[thick] (1.49cm,0) -- ++(0,-5cm)
+	node[draw=black,above=0.18cm,circle,fill=brown!70!black](cM){} node[draw=black,trapezium,rounded
+	corners=1pt,fill=brown!70!black,text=white, minimum height=0.7cm](M){M};
+	\draw [-latex,very thick,blue] (M.bottom side) -- ++(0,-1) node[midway,right]{$F_1$};
+	\draw [-latex,very thick,black] (cM.north) -- ++(0,1)node[midway,right]{$T_1$};
+
+	% Mass 2
+	\draw[thick] (-1.49cm,0) -- ++(0,-3.5cm)
+	node[draw=black,above=0.13cm,circle,fill=brown!70!black](cm){} node[draw=black,trapezium,rounded
+	corners=1pt,fill=brown!70!black,text=white, minimum height=0.6cm](m){m};
+	\draw [-latex,very thick,red] (m.bottom side) -- ++(0,-1)node[midway,left]{$F_2$};
+	\draw [-latex,very thick,black] (cm.north) -- ++(0,1)node[midway,left]{$T_2$};
+\end{tikzpicture}
+
+\end{document}