Hi - I've been keeping an eye of pygmt for a while. This seemed like a good place to start in helping out.

For the example, I've written it in 4 sections:

Adding text to maps (using various font/angle arguments) - from file, from matrix, from vectors.
Explicit demonstration of the justify argument
Explicit demonstration of the angle argument
Description of the font (-F) argument

In putting together this example along the lines of your other tutorials, I encountered a couple of points. Would be good to address/discuss them before I create a pull request.

When plotting text, the optional arguments that can be used in the textfile input don't appear to work. This seems to not be a PyGMT issue, as I had the same issue running the command in GMT 6 on the command line. Am I missing something? The GMT documentation suggests this should work fine. Currently it is treating the text file as if there were only 3 columns of input data (x, y, text).
Not strictly related to text, but I encountered it while putting together the examples. Calling plot(x=[1, 2], y=[1.1, 2.2]) does not produce the plot I expect. I expect a line joining (1, 1.1) to (2, 2.2). Instead, a line connecting (0, 2.2) to (1, 1.1) is plotted.
I believe the issue is the difference in data types (int/float), and it causes several quite odd things This is not an issue using plot(data=np.array([[1, 1.1], [2, 2.2]])), as numpy.array will cast a mixture of ints/floats to floats. Not sure whether to raise this as an actual issue, but my "correction" has been to specifically cast to numpy.float when using the pygmt.conversion.vectors_to_arrays function:

    arrays = [as_c_contiguous(np.asarray(i, dtype=np.float)) for i in vectors]

To reproduce this:

fig = pygmt.Figure()
fig.basemap(region=[0, 4, 0, 4], projection="X10c", frame=True)
fig.plot(x=[0, 4], y=[2., 2.])
fig.show()

Happy to move this to a separate issue.

Finally, if 1 is not addressed (or is just me missing something), then I am wondering if there might be a better way of constructing the argument string that is passed in under the -F flag. I understand it is currently directly relatable to how arguments are passed into GMT functions , but to me a more pythonic interface (along the lines of matplotlib) that constructs the argument string under the hood would be much appreciated! Something like a _construct method that takes the **kwargs (text_font, font_size, font_color or color) passed into text and builds it into the +f argument.

Apologies if I've just missed something! Let me know if there's any more information I can provide.

Need examples for adding texts on maps #469

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