Added refernces for docker and C

C/compiler.md

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+# Compiler
+
+To compile a C file run gcc on it
+
+    gcc file.c
+
+This will create an output file called a.out
+
+To show all warnings in the compiler use -Wall 
+
+    gcc file.c -Wall
+
+To actually show all warnings -Wextra and -pedantic should also be used
+
+    gcc file.c -Wextra -pedantic
+
+You can also change the standard of C, for example C99 which doesn't require a return in void functions
+
+	gcc file.c -std=c99
+
+These can also be used in conjunction
+
+# Output file
+
+To change the output file from a.out specify the name with the output flag
+
+    gcc file.c -o outputName
+
+
+# Single file compilation
+
+The compiler compiles one file at a time, generating an .obj file for each.
+
+# Linker
+
+To create a usable executable the .obj files need to be linked together. After compilation the linker will link these files together for use.
+
+
+

C/preprocessor.md

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+# Preprocessor
+
+The preprocessor comes before the compiler. 
+
+It's job is to prepare the source code for compilation.
+
+Anything that begins with a `#` is for the preprocessor, such as includes
+
+    #include <stdio.h>
+
+    #include "multiply.h"
+
+Which tells the compiler to compile these files together as one
+
+The preprocessor can also be used for macros
+
+    #define SQUARE(x) multiply(x,x)
+
+Macros, when called aren't like typical functions, instead the preprocessor replaces the macro call with the code itself.
+
+`SQUARE(10)` would be replaced with `multiply(10,10)`
+
+They can generate allsorts of code, such as CONSTANTS
+
+    #if LEVEL > 0
+    	/* conditionally do this code */
+    #endif

C/source_files.md

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+# Source Files
+
+# Source
+
+Source files need to be declared in the source file it's called in.
+
+- main.c
+    int main(){ multiply(4,5); }
+
+- multiply.c
+    int multiply(int x, int y){ return x * y; }
+
+Definitions in multiple need to be declared in main to be called.
+
+Function declaration could be added to main.c above the main function, and this would allow for function calls.
+
+However multiply's functions may want to be used in multiple different source files
+
+# Header
+
+Header files are used for declaration so they can be used in other source files.
+
+- multiply.h
+    int multiply(int,int);
+
+This header file will then be added to the main.c source file, at the top.
+
+- main.c
+    #include "multiply.h"
+
+That will include the contents of the multiply header file to the source file.

docker.md

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+# Docker
+
+# Make new container
+
+# Start/Stop containers
+
+    docker start <container>
+
+    docker stop <container>
+
+# Remove exisit containers
+
+    docker rm <container>