Add makefile content

2105-makefile/Makefile

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+## Simple Makefile by botanicals
+## Code available at https://git.disroot.org/botanicals/blog-files
+
+# Compiler and flags
+CC=gcc
+CFLAGS=-Wall -Wextra -pedantic
+LDLIBS=-lm		# math.h library
+
+# No recipes necessary.
+# `make` builds using implicit rules.

2105-makefile/README.md

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+# Simple Makefile
+
+Originally posted May 1st, 2021 on [Dreamwidth](https://campanilla.dreamwidth.org/4024.html).
+
+## Idea
+
+We were supposed to use CodeBlocks for programming classes at my school, but CodeBlocks kept breaking on me. I switched to using emacs as my text editor, and building and testing in the command line. For practice, we have to write a lot of short C programs. I saved each under their own name so I'd be able to comeback and analyze it when needed. To skip writing many flags recommended for beginners, i wrote a short makefile with help from folks on weirder.earth.
+
+For more background, check out the blog post.
+
+## Prerequisites 
+
+- [GNU make](https://gnu.org/software/make)
+- [gcc](https://gnu.org/software/gcc)
+
+## Usage 
+
+Download the Makefile from this folder and save it into the folder with your source files.
+
+Example of usage and output in the command line:
+
+``` sh
+[directory]$ ls
+4-1-13.c    Makefile
+[directory]$ make 4-1-13
+gcc -Wall -Wextra -pedantic 4-1-13.c -lm -o 4-1-13
+[directory]$ ls
+4-1-13.c    4-1-13  Makefile
+[directory]$ ./4-1-13
+# code runs
+```
+