add stackexchange examples

.gitignore

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+
+## Core latex/pdflatex auxiliary files:
+*.aux
+*.lof
+*.log
+*.lot
+*.fls
+*.out
+*.toc
+*.fmt
+*.fot
+*.cb
+*.cb2
+.*.lb
+
+## Build tool auxiliary files:
+*.fdb_latexmk
+*.synctex
+*.synctex(busy)
+*.synctex.gz
+*.synctex.gz(busy)
+*.pdfsync

notes.md

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+
+

stackexchange_2.tex

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+\documentclass{article}
+\usepackage{tikz}
+
+\usetikzlibrary{arrows}
+
+\tikzset{
+    vertex/.style={circle,draw,minimum size=1.5em},
+    edge/.style={->,> = latex'}
+}
+
+\begin{document}
+\begin{tikzpicture}
+
+    % vertices
+    \node[vertex] (1) at (0,0) {$1$};
+    \node[vertex] (2) at (2,0) {$2$};
+    \node[vertex] (3) at (0,-2) {$3$};
+    \node[vertex] (4) at (2,-2) {$4$};
+    \node[vertex] (5) at (-2,-2) {$5$};
+
+    %edges
+    \draw[edge] (1) -- (2) node[midway, above] {$\frac{1}{3}$};
+    \draw[edge] (1.260) -- (3.100);
+    \draw[edge] (1.325) -- (4.125) node[pos=.3, right, sloped, rotate=90] {$\frac{1}{3}$};
+    \draw[edge] (2) -- (3);
+    \draw[edge] (2) -- (4) node[midway, right] {$\frac{1}{2}$};
+    \draw[edge] (3.80) -- (1.280);
+    \draw[edge] (4) -- (3);
+    \draw[edge] (4.145) -- (1.305);
+    \draw[edge] (3.170) -- (5.10);
+    \draw[edge] (5.350) -- (3.190);
+
+\end{tikzpicture}
+\end{document}

stackexchange_test.tex

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+% from this example https://tex.stackexchange.com/questions/305375/how-to-position-labels-at-edges-of-tikz-figures/305391
+
+\documentclass{article}
+\usepackage{tikz}
+\usetikzlibrary{arrows,automata,positioning}
+\usepackage{amsmath,amssymb,amsfonts}
+
+\begin{document}
+\begin{tikzpicture}[>=stealth',
+    shorten > = 3pt,
+    node distance = 4cm and 4cm,
+    el/.style = {inner sep=2pt, align=left, sloped},
+    every label/.append style = {font=\tiny}
+    ]
+\node (data) [state, label=left:{label:10}]  {Data};
+\node (q1) [state,right=of data]                      {$s_1$};
+\node (q2) [state,below=of q1,
+            label=right:{label:20}]                 {$s_2$};
+\node (q3) [state,below=of data,
+            label=left:{label:5}]                   {$s_3$};
+\path[->]
+    (data)  edge [in=150,out=90,loop]
+                node[el,above] {Runs and re-runs}   (data)
+    (data)  edge [bend right=10]  node[el,below]  {$a=1$}         (q1)
+    (q1)  edge [bend right=10]  node[el,above]  {$a=0$}         (data)
+    (q1)  edge [bend right=10]  node[el,below]  {$a=2$}         (q2)
+    (q2)  edge [bend left=-10]  node[el,below]  {$a=1$}         (q1)
+    (data)  edge [bend right=10]  node[el,below]  {$a=3$}         (q3)
+    (q3)  edge [bend left=-10]  node[el,below]  {$a=0$}         (data)
+    (data)  edge [bend left= 10]  node[el,above,pos=0.8] {$a=2$}  (q2)
+    (q2)  edge [bend left= 10]  node[el,below,pos=0.8] {$a=0$}  (data)
+    (q1)  edge [bend left= 10]  node[el,above,pos=0.75] {$a=3$} (q3)
+    (q2)  edge [bend left= 10]  node[el,below]  {$a=3$}         (q3)
+    (q1)  edge [in=30, out=60,loop]
+                node[el,above,rotate=45] {$x=1$\\ $x:=x+1$}     (q1)
+    (q3)  edge [bend left=10]   node[el,below,pos=0.75] {$a=1$} (q1)
+    (q3)  edge [bend right=-10] node[el,above]  {$a=2$}         (q2)
+    (q2)  edge [in=-30,out=-60, loop]
+                node[el,below,rotate=-45] {$a=2$ \\ $x:=x+1$}   (q2)
+    (q3)  edge [in=-150,out=-120, loop]
+                node[el,below,rotate=45] {$a=3$ \\ $x:=x+1$}    (q3);
+\end{tikzpicture}
+\end{document}
+