Add bash scripts for tutorial 6 (#36)

Co-authored-by: Esteban82-HP <SU-CORREO-ELECTRONICO0>

book/tut6_scripts/0_earth.sh

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+# Making animations
+# Step 1. Make first image.
+# Step Goal: Create the first image of the animation.
+
+
+
+
+gmt begin Earth png
+    gmt grdimage @earth_relief_06m -I -JG0/0/13c
+gmt end

book/tut6_scripts/1_earth_animation.sh

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+# Making animations
+# Step 2. Make master frame.
+# Step Goal: Make a master frame that looks identical to the first image.
+# 1st attempt.
+
+
+cat << 'EOF' > main.sh
+gmt begin
+	gmt grdimage @earth_relief_06m -I -JG0/0/13c
+gmt end
+EOF
+gmt movie main.sh -NEarth -V -L+f14p,Helvetica-Bold,white -Gblack -Chd         -T360 -M0,png

book/tut6_scripts/2_earth_animation.sh

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+# Making animations
+# Step 2. Make master frame.
+# Step Goal: Make a master frame that looks identical to the first image.
+# 2nd attempt. Fix the canvas
+
+
+cat << 'EOF' > main.sh
+gmt begin
+	gmt grdimage @earth_relief_06m -I -JG0/0/13c -X0 -Y0
+gmt end
+EOF
+gmt movie main.sh -NEarth -V -L+f14p,Helvetica-Bold,white -Gblack -C13cx13cx80 -T360 -M0,png

book/tut6_scripts/3_earth_animation.sh

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+# Making animations
+# Step 3. Make draft animation
+# Step Goal: See that the video file is created properly.
+#            See that the frames are changing as expected.
+# 1st attempt. Reduce size and quality
+
+cat << 'EOF' > main.sh
+gmt begin
+	gmt grdimage @earth_relief_06m -I -JG0/0/13c -X0 -Y0
+gmt end
+EOF
+gmt movie main.sh -NEarth -V -L+f14p,Helvetica-Bold,white -Gblack -C13cx13cx30 -T10  -M0,png  -Fmp4 -Zs

book/tut6_scripts/4_earth_animation.sh

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+# Making animations
+# Step 3. Make draft animation
+# Step Goal: See that the video file is created properly.
+#            See that the frames are changing as expected.
+# 2nd attempt. Use parameter
+
+cat << 'EOF' > main.sh
+gmt begin
+	gmt grdimage @earth_relief_06m -I -JG-${MOVIE_FRAME}/0/${MOVIE_WIDTH} -Y0 -X0
+gmt end
+EOF
+gmt movie main.sh -NEarth -V -L+f14p,Helvetica-Bold,white -Gblack -C13cx13cx30 -T10  -M0,png  -Fmp4 -Zs

book/tut6_scripts/5_earth_animation.sh

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+# Making animations
+# Step 4. Make full animation
+# Step Goal: Get the final animation.
+# Increase number of frames (-T) and movie quality (-C).
+
+
+cat << 'EOF' > main.sh
+gmt begin
+	gmt grdimage @earth_relief_06m -I -JG-${MOVIE_FRAME}/0/${MOVIE_WIDTH} -Y0 -X0
+gmt end
+EOF
+gmt movie main.sh -NEarth -V -L+f14p,Helvetica-Bold,white -Gblack -C13cx13cx80 -T360 -M0,png  -Fmp4 -Zs