Merge pull request #47 from Niichan/master

Cheatsheets added

cheatsheets/apk

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+# Install a package
+apk add $package
+
+# Remove a package
+apk del $package
+
+# Update repos
+apk update
+
+# Upgrade all packages
+apk upgrade
+
+# Find a package
+apk search $package

cheatsheets/gcc

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+# Compile a file
+gcc file.c
+
+# Compile a file with a custom output
+gcc -o file file.c
+
+# Debug symbols
+gcc -g

cheatsheets/grep

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+# Basic
+grep pattern file
+
+# Advanced
+grep -R pattern folder
+cat file | grep pattern

cheatsheets/vim

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+# Appending
+a - drops vim into append mode
+i - enters append mode without character skip
+
+# File management
+:w - writes (saves) file
+:q - quits
+;q! - quits without saving changes